Heartland Financial USA (HTLF) 10-Q 8 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 06, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	HEARTLAND FINANCIAL USA INC
Entity Central Index Key	920,112
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		29,949,070

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 180,751	$ 151,290
Interest bearing deposits with the Federal Reserve Bank and other banks and other short-term investments	70,985	7,434
Cash and cash equivalents	251,736	158,724
Time deposits in other financial institutions	19,793	2,105
Securities:
Available for sale, at fair value (cost of $2,124,232 at September 30, 2017, and $1,893,947 at December 31, 2016)	2,093,385	1,845,864
Held to maturity, at cost (fair value of $270,386 at September 30, 2017, and $274,799 at December 31, 2016)	256,355	263,662
Other investments, at cost	23,176	21,560
Loans held for sale	35,795	61,261
Loans receivable:
Held to maturity	6,373,415	5,351,719
Allowance for loan losses	(54,885)	(54,324)
Loans receivable, net	6,318,530	5,297,395
Premises, furniture and equipment, net	174,533	163,614
Premises, furniture and equipment held for sale	4,428	414
Other real estate, net	13,226	9,744
Goodwill	236,615	127,699
Core deposit intangibles and customer relationship intangibles, net	37,028	22,775
Servicing rights, net	26,599	35,778
Cash surrender value on life insurance	142,073	112,615
Other assets	122,355	123,869
TOTAL ASSETS	9,755,627	8,247,079
Deposits:
Demand	3,009,940	2,202,036
Savings	4,227,340	3,788,089
Time	994,604	857,286
Total deposits	8,231,884	6,847,411
Short-term borrowings	171,871	306,459
Other borrowings	301,473	288,534
Accrued expenses and other liabilities	68,715	63,759
TOTAL LIABILITIES	8,773,943	7,506,163
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; 40,000,000 shares authorized at September 30, 2017, and 30,000,000 shares authorized at December 31, 2016; issued 29,946,069 shares at September 30, 2017, and 26,119,929 shares at December 31, 2016)	29,946	26,120
Capital surplus	503,262	328,376
Retained earnings	468,556	416,109
Accumulated other comprehensive loss	(21,018)	(31,046)
Treasury stock at cost (0 shares at both September 30, 2017, and December 31, 2016)	0	0
TOTAL STOCKHOLDERS' EQUITY	981,684	740,916
TOTAL LIABILITIES AND EQUITY	9,755,627	8,247,079
Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series A Junior Participating Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series C Senior Non-Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series D Senior Non-Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 938	$ 1,357

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cost of available for sale securities	$ 2,124,232	$ 1,893,947
Fair value of held to maturity securities	$ 270,386	$ 274,799
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (shares)	40,000,000	30,000,000
Common stock, shares issued (shares)	29,946,069	26,119,929
Treasury stock (shares)	0	0
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (shares)	17,604	17,604
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series A Junior Participating Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (shares)	16,000	16,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series C Senior Non-Cumulative Perpetual Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (shares)	81,698	81,698
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series D Senior Non-Cumulative Perpetual Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (shares)	3,000	3,000
Preferred stock, shares issued (shares)	745	1,078
Preferred stock, shares outstanding (shares)	745	1,078

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
INTEREST INCOME:
Interest and fees on loans	$ 82,906	$ 70,046	$ 217,898	$ 208,280
Interest on securities:
Taxable	10,394	7,917	27,246	24,604
Nontaxable	5,086	3,717	15,297	10,793
Interest on federal funds sold	34	1	37	12
Interest on interest bearing deposits in other financial institutions	558	6	1,112	13
TOTAL INTEREST INCOME	98,978	81,687	261,590	243,702
INTEREST EXPENSE:
Interest on deposits	5,073	4,001	12,966	12,195
Interest on short-term borrowings	271	235	498	1,083
Interest on other borrowings (includes $308 and $492 of interest expense related to derivatives reclassified from accumulated other comprehensive income for the three months ended September 30, 2017 and 2016, respectively, and $1,005 and $1,463 of interest expense related to derivatives reclassified from accumulated other comprehensive income for the nine months ended September 30, 2017 and 2016, respectively)	3,790	3,770	10,674	10,918
TOTAL INTEREST EXPENSE	9,134	8,006	24,138	24,196
NET INTEREST INCOME	89,844	73,681	237,452	219,506
Provision for loan losses	5,705	5,328	10,235	9,513
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	84,139	68,353	227,217	209,993
NONINTEREST INCOME:
Service charges and fees	10,138	8,278	29,291	23,462
Loan servicing income	1,161	873	4,236	3,433
Trust fees	3,872	3,689	11,482	11,127
Brokerage and insurance commissions	950	1,006	2,962	2,914
Securities gains, net (includes $1,679 and $1,586 of net security gains reclassified from accumulated other comprehensive income for the three months ended September 30, 2017 and 2016, respectively, $5,553 and $9,964 of net security gains reclassified from accumulated other comprehensive income for the nine months ended September 30, 2017 and 2016, respectively)	1,679	1,584	5,553	9,732
Net gains on sale of loans held for sale	4,997	11,459	17,961	33,794
Valuation allowance on commercial servicing rights	5	5	29	(41)
Income on bank owned life insurance	766	620	2,039	1,733
Other noninterest income	1,409	1,028	2,941	2,992
TOTAL NONINTEREST INCOME	24,977	28,542	76,494	89,146
NONINTEREST EXPENSES:
Salaries and employee benefits	45,225	40,733	128,118	124,432
Occupancy	6,223	5,099	16,352	15,322
Furniture and equipment	2,826	2,746	7,913	7,301
Professional fees	8,450	5,985	24,342	20,481
FDIC insurance assessments	894	1,180	2,610	3,468
Advertising	1,358	1,339	5,141	4,174
Core deposit intangibles and customer relationship intangibles amortization	1,863	1,291	4,252	4,483
Other real estate and loan collection expenses	581	640	1,774	1,871
Loss on sales/valuations of assets, net	1,342	794	1,642	1,064
Other noninterest expenses	9,997	8,620	27,653	27,160
TOTAL NONINTEREST EXPENSES	78,759	68,427	219,797	209,756
INCOME BEFORE INCOME TAXES	30,357	28,468	83,914	89,383
Income taxes (includes $511 and $408 of income tax expense reclassified from accumulated other comprehensive income for the three months ended September 30, 2017 and 2016, respectively, $1,696 and $3,171 of income tax expense reclassified from accumulated other comprehensive income for the nine months ended September 30, 2017 and 2016, respectively)	8,725	8,260	22,314	28,196
NET INCOME	21,632	20,208	61,600	61,187
Preferred dividends	(13)	(53)	(45)	(273)
Interest expense on convertible preferred debt	3	17	12	48
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 21,622	$ 20,172	$ 61,567	$ 60,962
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 0.73	$ 0.82	$ 2.23	$ 2.51
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	0.72	0.81	2.21	2.48
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.11	$ 0.10	$ 0.33	$ 0.30

Consolidated Statements of Inc5

Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest expense related to derivatives reclassified from accumulated other comprehensive income	$ 3,790	$ 3,770	$ 10,674	$ 10,918
Net security gains reclassified from accumulated other comprehensive income	1,679	1,584	5,553	9,732
Income tax expense reclassified from accumulated other comprehensive income	8,725	8,260	22,314	28,196
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Derivatives
Interest expense related to derivatives reclassified from accumulated other comprehensive income	308	492	1,005	1,463
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Net security gains reclassified from accumulated other comprehensive income	1,679	1,586	5,553	9,964
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income (Loss)
Income tax expense reclassified from accumulated other comprehensive income	$ 511	$ 408	$ 1,696	$ 3,171

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 21,632	$ 20,208	$ 61,600	$ 61,187
Securities:
Net change in unrealized gain on securities	6,940	(5,696)	22,002	18,274
Reclassification adjustment for net gains realized in net income	(1,679)	(1,586)	(5,553)	(9,964)
Net change in non-credit related other than temporary impairment	0	0	0	7
Income taxes	(2,084)	2,871	(6,433)	(3,364)
Other comprehensive income (loss) on securities	3,177	(4,411)	10,016	4,953
Derivatives used in cash flow hedging relationships:
Net change in unrealized loss on derivatives	17	844	(656)	(4,623)
Reclassification adjustment for net losses on derivatives realized in net income	308	492	1,005	1,463
Income taxes	(123)	(517)	(337)	1,155
Other comprehensive income (loss) on cash flow hedges	202	819	12	(2,005)
Other comprehensive income (loss)	3,379	(3,592)	10,028	2,948
TOTAL COMPREHENSIVE INCOME	$ 25,011	$ 16,616	$ 71,628	$ 64,135

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 61,600	$ 61,187
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,738	22,975
Provision for loan losses	10,235	9,513
Net amortization of premium on securities	20,186	24,093
Securities gains, net	(5,553)	(9,732)
Stock based compensation	3,588	3,073
Loans originated for sale	(548,768)	(863,354)
Proceeds on sales of loans held for sale	586,202	883,758
Net gains on sale of loans held for sale	(11,968)	(23,938)
Decrease in accrued interest receivable	(1,449)	(1,054)
(Increase) decrease in prepaid expenses	838	(128)
Increase in accrued interest payable	1,104	332
Capitalization of servicing rights	(5,993)	(9,856)
Valuation allowance on commercial servicing rights	(29)	41
Write downs and losses on sales of assets, net	1,642	1,064
Net excess tax benefit from stock based compensation	1,121	1,121
Other, net	(5,637)	(2,419)
NET CASH PROVIDED BY OPERATING ACTIVITIES	129,857	96,676
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of securities available for sale	1,127,091	768,617
Proceeds from the sale of securities held to maturity	0	4,557
Proceeds from the sale of other investments	0	4,722
Proceeds from the redemption of time deposits in other financial institutions	12,171	0
Proceeds from the maturity of and principal paydowns on securities available for sale	161,827	130,549
Proceeds from the maturity of and principal paydowns on securities held to maturity	6,645	8,271
Proceeds from the maturity of and principal paydowns on time deposits in other financial institutions	24,931	250
Proceeds from the maturity of and principal paydowns on other investments	2,574	0
Purchase of securities available for sale	(1,299,492)	(888,903)
Purchase of other investments	(1,012)	(1,875)
Net decrease in loans	45,139	138,725
Purchase of bank owned life insurance policies	(2,000)	0
Proceeds from bank owned life insurance policies	0	111
Proceeds from sale of mortgage servicing rights	5,137	0
Capital expenditures	(6,876)	(8,318)
Net cash and cash equivalents received in acquisitions	71,089	8,084
Proceeds from the sale of equipment	1,845	686
Proceeds on sale of OREO and other repossessed assets	7,578	3,266
NET CASH PROVIDED BY INVESTING ACTIVITIES	156,647	168,742
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand deposits	181,206	160,313
Net increase (decrease) in savings deposits	(179,721)	51,530
Net decrease in time deposit accounts	(8,582)	(353,084)
Proceeds on short-term revolving credit line	20,000	0
Repayments on short-term revolving credit line	(15,000)	0
Net decrease in short-term borrowings	(168,667)	(101,409)
Proceeds from short term FHLB advances	186,039	243,100
Repayments of short term FHLB advances	(191,405)	(257,250)
Proceeds from other borrowings	0	40,000
Repayments of other borrowings	(8,573)	(15,562)
Redemption of preferred stock	0	(81,698)
Purchase of treasury stock	(440)	(2,293)
Proceeds from issuance of common stock	804	1,863
Dividends paid	(9,153)	(7,638)
NET CASH USED BY FINANCING ACTIVITIES	(193,492)	(322,128)
Net increase (decrease) in cash and cash equivalents	93,012	(56,710)
Cash and cash equivalents at beginning of year	158,724	258,799
CASH AND CASH EQUIVALENTS AT END OF PERIOD	251,736	202,089
Supplemental disclosures:
Cash paid for income/franchise taxes	10,775	16,550
Cash paid for interest	23,034	23,864
Loans transferred to OREO	4,955	1,359
Purchases of securities available for sale, accrued, not settled	2,063	0
Sales of securities available for sale, accrued, not settled	125	250
Conversion of convertible debt to common stock	558	0
Conversion of Series D preferred stock to common stock	419	0
Stock consideration granted for acquisitions	$ 175,196	$ 57,433

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Series C Preferred Stock	Series D Preferred Stock	Preferred Stock	Preferred StockSeries C Preferred Stock	Preferred StockSeries D Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Retained EarningsSeries C Preferred Stock	Retained EarningsSeries D Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at beginning of period at Dec. 31, 2015	$ 663,173			$ 81,698			$ 22,436	$ 216,436	$ 348,630			$ (6,027)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	64,135								61,187			2,948
Cash dividends declared:
Preferred		$ (168)	$ (105)							$ (168)	$ (105)
Common	(7,365)								(7,365)
Redemption of Preferred Stock					$ (81,698)	$ (2,420)
Issuance of Series D Preferred Stock						3,777
Purchase of shares of common stock	(2,293)												(2,293)
Issuance of shares of common stock	64,279						2,247	59,807					2,225
Stock based compensation	3,073							3,073
Balance at end of period at Sep. 30, 2016	704,388			1,357			24,683	279,316	402,179			(3,079)	(68)
Balance at beginning of period at Dec. 31, 2016	740,916			1,357			26,120	328,376	416,109			(31,046)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	71,628								61,600			10,028
Cash dividends declared:
Preferred			$ (45)								$ (45)
Common	(9,108)								(9,108)
Conversion of Series D preferred stock						$ (419)
Purchase of shares of common stock	(440)												(440)
Issuance of shares of common stock	175,564						3,826	171,298					440
Stock based compensation	3,588							3,588
Balance at end of period at Sep. 30, 2017	$ 981,684			$ 938			$ 29,946	$ 503,262	$ 468,556			$ (21,018)	$ 0

Consolidated Statements of Cha9

Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash dividends per share common stock (in dollars per share)	$ 0.33	$ 0.30
Shares of common stock purchased (in shares)	9,392	49,785
Shares of common stock issued (in shares)	3,835,532	2,295,472
Series C Preferred Stock
Cash dividends per share preferred stock (in dollars per share)		$ 2.50
Series D Preferred Stock
Cash dividends per share preferred stock (in dollars per share)	$ 52.50	$ 35

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2016 , included in the Form 10-K of Heartland Financial USA, Inc. ("Heartland") filed with the Securities and Exchange Commission ("SEC") on March 1, 2017 . Foot note disclosures to the interim unaudited consolidated financial statements which would substantially duplicate the disclosure contained in the footnotes to the audited consolidated financial statements have been omitted. The financial information of Heartland included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments), that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. The results of the interim period ended September 30, 2017 , are not necessarily indicative of the results expected for the year ending December 31, 2017 . Earnings Per Share Basic earnings per share is determined using net income available to common stockholders and weighted average common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average common shares and assumed incremental common shares issued. Amounts used in the determination of basic and diluted earnings per share for the three- and nine- month periods ended September 30, 2017 and 2016 , are shown in the table below: Three Months Ended (Dollars and number of shares in thousands, except per share data) 2017 2016 Net income $ 21,632 $ 20,208 Preferred dividends and discount (13 ) (53 ) Interest expense on convertible preferred debt 3 17 Net income available to common stockholders $ 21,622 $ 20,172 Weighted average common shares outstanding for basic earnings per share 29,648 24,601 Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units 262 322 Weighted average common shares for diluted earnings per share 29,910 24,923 Earnings per common share — basic $ 0.73 $ 0.82 Earnings per common share — diluted $ 0.72 $ 0.81 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation — — Nine Months Ended (Dollars and number of shares in thousands, except per share data) 2017 2016 Net income $ 61,600 $ 61,187 Preferred dividends (45 ) (273 ) Interest expense on convertible preferred debt 12 48 Net income available to common stockholders $ 61,567 $ 60,962 Weighted average common shares outstanding for basic earnings per share 27,569 24,262 Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units 265 319 Weighted average common shares for diluted earnings per share 27,834 24,581 Earnings per common share — basic $ 2.23 $ 2.51 Earnings per common share — diluted $ 2.21 $ 2.48 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation — — Stock-Based Compensation Heartland may grant, through its Nominating and Compensation Committee (the "Compensation Committee"), non-qualified and incentive stock options, stock appreciation rights, stock awards, restricted stock, restricted stock units and cash incentive awards, under its 2012 Long-Term Incentive Plan (the "Plan"). The Plan was originally approved by stockholders in May 2012 and was amended effective March 8, 2016, to increase the number of shares of common stock authorized for issuance and make certain other changes to the Plan. As of September 30, 2017 , 499,656 shares of common stock were available for issuance under future awards that may be granted under the Plan to employees and directors of, and service providers to, Heartland or its subsidiaries. Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 718, "Compensation-Stock Compensation" requires the measurement of the cost of employee services received in exchange for an award of equity instruments based upon the fair value of the award on the grant date. The cost of the award is based upon its fair value estimated on the date of grant and recognized in the consolidated statements of income over the vesting period of the award. The fair market value of restricted stock and restricted stock units is based on the fair value of the underlying shares of common stock on the date of grant. The fair value of stock options is estimated on the date of grant using the Black-Scholes model. Forfeitures are accounted for as they occur. The amount of tax benefit related to the exercise, vesting and forfeiture of equity-based awards reflected as a tax benefit in Heartland's income tax expense was $1.1 million during the nine months ended September 30, 2017 . Prior to the adoption of ASU 2016-09 on January 1, 2017, $1.1 million of tax benefit related to the exercise, vesting and forfeiture of equity based awards was reflected in additional paid-in-capital during the nine months ended September 30, 2016. Restricted Stock Units The Plan permits the Compensation Committee to grant restricted stock units ("RSUs"). In the first quarter of 2017, the Compensation Committee granted time-based RSUs with respect to 55,665 shares of common stock, and in the first quarter of 2016, the Compensation Committee granted time-based RSUs with respect to 72,644 shares of common stock to selected officers and employees. The time-based RSUs represent the right, without payment, to receive shares of Heartland common stock on a specified future date in three equal installments starting in the year following the initial grant. The time-based RSUs will be settled in common stock upon vesting, and will not be entitled to dividends until vested. The time-based RSUs may also vest upon death or disability, upon a change in control or upon a "qualified retirement" (as defined in the RSU agreement). The retiree is required to sign a non-solicitation agreement as a condition to vesting. In addition to the time-based RSUs referenced in the preceding paragraph, the Compensation Committee granted performance-based RSUs with respect to 27,570 shares of common stock in the first quarter of 2017, and 35,516 shares of common stock in the first quarter of 2016. These performance-based RSUs are earned based on satisfaction of performance targets for the fiscal years ended December 31, 2017, and December 31, 2016, respectively, and then fully vest on a specified date in the third calendar year following the year of the initial grant. The performance-based RSUs vest to the extent that they are earned upon death or disability, upon a change in control or upon a "qualified retirement." The Compensation Committee also granted three -year performance-based RSUs with respect to 9,032 shares of common stock in the first quarter of 2017, and 11,408 shares of common stock in the first quarter of 2016. These performance-based RSUs will be earned based on satisfaction of performance targets for the three -year performance period ended December 31, 2019, and December 31, 2018, respectively. These performance-based RSUs or a portion thereof may vest in 2020 and 2019, respectively, after measurement of performance in relation to the performance targets. Upon death, disability, or a "qualified retirement," all performance-based RSUs granted in 2016 remain outstanding and are earned based on actual performance at the end of each performance period. All RSUs granted on or after March 8, 2016, become fully vested upon a change in control if (1) they are not assumed by the successor corporation or (2) upon an involuntary termination of the participant's employment within two years after the change in control. The Compensation Committee may grant RSUs under the Plan to directors as part of their compensation, to new management level employees at commencement of employment, and to other employees and service providers as incentives. During the nine months ended September 30, 2017 , and September 30, 2016 , 16,804 and 24,153 time-based RSUs, respectively, were granted to directors and new employees. A summary of the RSUs outstanding as of September 30, 2017 and 2016 , and changes during the nine months ended September 30, 2017 and 2016 , follows: 2017 2016 Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding at January 1 346,817 $ 27.61 353,195 $ 25.53 Granted 109,071 47.21 143,721 29.75 Vested (136,428 ) 26.66 (117,898 ) 23.44 Forfeited (12,923 ) 31.57 (11,547 ) 27.12 Outstanding at September 30 306,537 $ 34.72 367,471 $ 27.60 Total compensation costs recorded for RSUs were $3.6 million and $3.1 million for the nine -month periods ended September 30, 2017 and 2016 . As of September 30, 2017 , there were $4.3 million of total unrecognized compensation costs related to the Plan for RSUs that are expected to be recognized through 2020. Options Although the Plan provides authority to the Compensation Committee to grant stock options, no options were granted during the first nine months of 2017 and 2016 . Prior to 2009, options were typically granted annually with an expiration date ten years after the date of grant. Vesting was generally over a five -year service period with equal portions of a grant becoming exercisable at three years, four years, and five years after the date of grant. A summary of the stock options outstanding as of September 30, 2017 and 2016 , and changes during the nine months ended September 30, 2017 and 2016 , follows: 2017 2016 Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Outstanding at January 1 26,400 $ 18.60 125,950 $ 24.08 Granted — — — — Exercised (13,650 ) 18.60 (55,250 ) 24.82 Forfeited (500 ) 18.60 (1,500 ) 21.10 Outstanding at September 30 12,250 $ 18.60 69,200 $ 23.55 Options exercisable at September 30 12,250 $ 18.60 69,200 $ 23.55 At September 30, 2017 , the vested options totale d 12,250 shares with a weighted average exercise price of $ 18.60 per share and a weighted average remaining contractual life of 0.32 years. The intrinsic value (the difference between the market price and the aggregate exercise price) for the vested options as of September 30, 2017 , was $377,000 . The intrinsic value for the total of all options exercised during the nine months ended September 30, 2017 , was $379,000 . The exercise price of stock options granted is established by the Compensation Committee, but the exercise price for the stock options may not be less than the fair market value of the shares on the date that the option is granted or, if greater, the par value of a share of stock. Each option granted is exercisable in full at any time or from time to time, subject to vesting provisions, as determined by the Compensation Committee and as provided in the option agreement, but such time may not exceed ten years from the grant date. Cash received from options exercised was $ 254,000 for the nine months ended September 30, 2017 , and $1.4 million for the nine months ended September 30, 2016 . No compensation costs were recorded for options during the nine month periods ended September 30, 2017 and 2016 . There are no unrecorded compensation costs related to options at September 30, 2017 . No stock options vested during the nine -month periods ended September 30, 2017 and 2016 . Subsequent Events - Heartland has evaluated subsequent events that may require recognition or disclosure through the filing date of this Quarterly Report on Form 10-Q with the SEC. Effect of New Financial Accounting Standards In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." The amendment clarifies the principles for recognizing revenue and develops a common revenue standard. The amendment outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” In applying the revenue model to contracts within its scope, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The new guidance does not apply to certain contracts within the scope of other ASC Topics, such as lease contracts, insurance contracts, financing arrangements, financial instruments, guarantees other than product or service warranties and nonmonetary exchanges between entities in the same line of business to facilitate sales to customers. Heartland continues to evaluate noninterest income contracts affected by the new guidance by analyzing contracts and current accounting practices to determine if a change is appropriate. The amendment is largely consistent with existing guidance and current practices. Heartland intends to adopt the accounting standard in 2018, as required, which may require a change in the recognition of certain recurring revenue streams within trust and investment management fees; however, Heartland's preliminary analysis suggests the adoption of these amendments are not expected to have a significant effect on Heartland's results of operations, financial position and liquidity other than expanded disclosure requirements. In January 2016, the FASB issued ASU 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities." The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, make the following changes: (1) require equity investments to be measured at fair value with changes in fair value recognized in net income; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (3) eliminate the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (4) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (5) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (6) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; (7) clarify that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item (5) above, early adoption of the amendments in this update is not permitted. Heartland intends to adopt the accounting standard in 2018, as required, and is currently evaluating the potential impact of this guidance on its results of operations, financial position and liquidity. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." Topic 842 requires a lessee to recognize leases on its balance sheet and disclose key information about leasing arrangements. The new standard establishes a right-of-use model (ROU) that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as financing or operating, with such classification affecting the categorization of expense recognition in the income statement. The amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and will be applied on a modified retrospective basis. Heartland leases certain properties and equipment under operating leases that will result in recognition of lease assets and lease liabilities on the consolidated balance sheets under this ASU; however the majority of Heartland's properties and equipment are owned and not leased. Heartland intends to adopt the accounting standard in 2019 as required. In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718)." The amendments in this ASU simplify several aspects of the accounting for share-based payments, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The amendments in this ASU are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption was permitted for any interim or annual period prior to the effective date. Heartland adopted this ASU on January 1, 2017, as required, using a prospective transition method. The requirement to report the excess tax benefit or shortfall related to settlements of share-based payment awards in earnings as an increase or decrease to tax expense has been applied to settlements occurring on or after January 1, 2017, and the impact of applying the guidance reduced reported income tax expense by $1.1 million . ASU 2016-09 also requires that all income tax related cash flows resulting from share-based payments be reported as an operating activity in the consolidated statements of cash flows. Previously income tax benefits resulting from the settlement of a share-based award were reported as a reduction of operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the period in which the share-based awards vested. Heartland elected to adopt the change in cash flow classification on a retrospective basis, which resulted in a $1.1 million increase to net cash from operating activities and a corresponding decrease to net cash from financing activities in the accompanying consolidated statement of cash flows for the nine months ended September 30, 2016. Heartland has elected to account for forfeitures as they occur. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326)." The amendments in this ASU require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The amendments in this ASU indicate that an entity should not use the length of time a security has been in an unrealized loss position to avoid recording a credit loss. In addition, in determining whether a credit loss exists, the amendments in this ASU also remove the requirements to consider the historical and implied volatility of the fair value of a security and recoveries or declines in fair value after the balance sheet date. The amendments are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Heartland intends to adopt the accounting standard in 2020, as required. Heartland has formed a committee to review the standard, understand the potential impact of this guidance on its results of operations, financial position and liquidity, and oversee the implementation of the standard. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments." The amendments in this update address eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity adopts the amendments early in an interim period, any adjustments must be reflected as of the beginning of the fiscal year that includes the interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The amendments in this update must be applied using a retrospective transition method to each period presented. Heartland intends to adopt this ASU in 2018, as required, and is currently evaluating the potential impact on its results of operations, financial position, and liquidity. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740) - Intra-Entity Transfer of Assets Other Than Inventory." The amendment requires an entity to recognize income tax consequences on an intra-entity transfer of an asset other than inventory at the time the transaction occurs. The amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The amendments must be applied using a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Heartland intends to adopt this ASU in 2018, as required, and the adoption of this amendment is not expected to have a significant effect on Heartland's results of operations, financial position and liquidity. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350)." This amendment is to simplify the subsequent measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing the impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized cannot exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied prospectively. Early adoption is permitted, including in an interim period for impairment tests performed after January 1, 2017. Heartland intends to adopt this ASU in the third quarter of 2020, consistent with the annual impairment test as of September 30, 2020, and is currently evaluating the potential impact of this guidance on its results of operations, financial position and liquidity. In March 2017, the FASB issued ASU 2017-08, "Receivables - Nonrefundable Fee and Other Costs (Subtopic 310-20)." These amendments shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount. Discounts continue to be amortized to maturity. These amendments are effective for public business entities for fiscal years and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If any entity early adopts the amendments in an interim period, any adjustments must be reflected as of the beginning of the fiscal year that includes the interim period. The amendments must be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Heartland intends to adopt this ASU in 2019, as required, and is currently evaluating the potential impact on its results of operations, financial position, and liquidity. In May 2017, the FASB issued ASU 2017-09, " Compensation - Stock Compensation (Topic 718) ." The amendments provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. An entity should account for the effects of a modification unless all the following are met; (1) the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification; (2) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; (3) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments are effective for annual periods and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim periods for public business entities for reporting periods for which financial statements have not yet been issued. The amendments should be applied prospectively to an award modified on or after the adoption date. Heartland intends to adopt this ASU in 2018, as required, and does not believe there will be a material impact to its results of operations, financial position, and liquidity because Heartland has not typically modified share-based payment awards after the original award has been granted. In August 2017, the FASB issued ASU 2017-12, " Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ." The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which Heartland will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. Heartland currently intends to adopt this ASU in 2019, as required, and does not believe there will be a material impact to its results of operations, financial position, and liquidity.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS Citywide Banks of Colorado, Inc. On July 7, 2017, Heartland acquired Citywide Banks of Colorado, Inc., parent company of Citywide Banks, headquartered in Aurora, Colorado. The transaction consideration was approximately $211.2 million , of which $58.6 million was cash, and the remainder was settled by delivery of 3,216,161 shares of Heartland common stock. Simultaneous with the close, Citywide Banks merged into Heartland's Centennial Bank and Trust subsidiary, and the combined entity operates as Citywide Banks. The transaction included, at fair value, total assets of $1.49 billion , including $985.4 million of net loans outstanding, and $1.21 billion of deposits on the acquisition date. Included in this transaction was one bank building with a fair value of $1.4 million that Heartland intends to sell and is classified as premises, furniture and equipment held for sale on the consolidated balance sheet. The transaction was a tax-free reorganization with respect to the stock consideration received by the stockholders of Citywide Banks of Colorado, Inc. The assets and liabilities of Citywide Banks of Colorado, Inc. were recorded on the consolidated balance sheet at the estimated fair value on the acquisition date. The following table represents, in thousands, the amounts recorded on the consolidated balance sheet as of July 7, 2017: As of July 7, 2017 Fair value of consideration paid: Common stock (3,216,161 shares) $ 152,607 Cash 58,636 Total consideration paid 211,243 Fair value of assets acquired: Cash and due from banks 21,341 Interest bearing deposits in other financial institutions 74,686 Time deposits in other financial institutions 6,304 Securities: Securities available for sale 234,390 Other securities 2,628 Loans held to maturity 985,399 Premises, furniture and equipment, net 17,206 Premises, furniture and equipment held for sale 1,350 Other real estate, net 6,916 Other intangible assets, net 16,041 Other assets 32,278 Total assets 1,398,539 Fair value of liabilities assumed: Deposits 1,210,074 Short term borrowings 34,445 Other borrowings 21,636 Other liabilities 16,295 Total liabilities assumed 1,282,450 Fair value of net assets acquired 116,089 Goodwill resulting from acquisition $ 95,154 Heartland recognized $95.2 million of goodwill in conjunction with the acquisition of Citywide Banks of Colorado, Inc., which is calculated as the excess of both the consideration exchanged and the liabilities assumed as compared to the fair value of identifiable assets acquired. Goodwill resulted from the expected operational synergies, enhanced market area, cross-selling opportunities and expanded business lines. See Note 6 for further information on goodwill. Pro Forma Information (unaudited): The following pro forma information represents the results of operations for the nine-month periods ended September 30, 2017, and 2016, as if the Citywide Banks of Colorado, Inc. acquisition occurred on January 1, 2017, and January 1, 2016, respectively: (Dollars in thousands, except per share data), unaudited For the Nine Months Ended September 30, 2017 September 30, 2016 Net interest income $ 264,485 $ 256,579 Net income available to common stockholders $ 61,940 $ 68,857 Basic earnings per share $ 2.08 $ 2.51 Diluted earnings per share $ 2.06 $ 2.48 The above pro forma results are presented for illustrative purposes and are not intended to represent or be indicative of the actual results of operations of the merged companies that would have been achieved had the acquisition occurred on January 1, 2016, nor are they intended to represent or be indicative of future results of operations. The pro forma results do not include expected operating cost savings as a result of the acquisition or adjustments for $10.1 million of transaction costs recorded by Citywide Banks of Colorado Inc. prior to the acquisition. These pro forma results require significant estimates and judgments particularly with respect to valuation and accretion of income associated with the acquired loans. Heartland incurred $3.8 million of pre-tax merger related expenses in the nine months ended September 30, 2017, associated with the Citywide Banks of Colorado, Inc. acquisition. The merger expenses are reflected on the consolidated statements of income for the applicable period and are reported primarily in the categories of salaries and employee benefits, professional fees, loss on sales/valuations of assets, net and other noninterest expenses. Acquired loans were preliminarily recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, projected default rates, loss given defaults and recovery rates. No allowance for credit losses was carried over from the acquisition. The balance of nonaccrual loans on the acquisition date was $1.1 million . Founders Bancorp On February 28, 2017, Heartland acquired Founders Bancorp, parent company of Founders Community Bank, based in San Luis Obispo, California. The purchase price was approximately $31.0 million , which was paid by delivery of 455,877 shares of Heartland common stock and cash of $8.4 million . The transaction included, at fair value, total assets of $213.9 million , loans of $96.4 million , and deposits of $181.5 million on the acquisition date. The transaction also included one bank building with a fair value of $576,000 that Heartland sold during the second quarter of 2017. Simultaneous with the closing of the transaction, Founders Community Bank merged into Heartland's Premier Valley Bank subsidiary. The transaction was a tax-free reorganization with respect to the stock consideration received by the stockholders of Founders Bancorp. CIC Bancshares, Inc. On February 5, 2016, Heartland completed the acquisition of CIC Bancshares, Inc., parent company of Centennial Bank, headquartered in Denver, Colorado. The purchase price was approximately $76.9 million , which was paid by delivery of 2,003,235 shares of Heartland common stock and cash of $15.7 million . In addition, Heartland issued a new series of convertible preferred stock with a fair value of $3.8 million and assumed convertible notes and subordinated debt totaling approximately $7.9 million . Simultaneous with the closing of the transaction, Centennial Bank merged into Heartland's Summit Bank & Trust, with the resulting institution operating under the name, Centennial Bank and Trust. As of the close date, the transaction included, at fair value, total assets of $772.6 million , total loans of $581.5 million , and total deposits of $648.1 million . The transaction was a tax-free reorganization with respect to the stock consideration received by the stockholders of CIC Bancshares, Inc.

Securities

Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES The amortized cost, gross unrealized gains and losses, and estimated fair values of securities available for sale as of September 30, 2017 , and December 31, 2016 , are summarized in the table below, in thousands: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2017 U.S. government corporations and agencies $ 7,435 $ 14 $ (34 ) $ 7,415 Mortgage-backed securities 1,593,677 4,656 (32,933 ) 1,565,400 Obligations of states and political subdivisions 506,867 4,307 (7,200 ) 503,974 Total debt securities 2,107,979 8,977 (40,167 ) 2,076,789 Equity securities 16,253 343 — 16,596 Total $ 2,124,232 $ 9,320 $ (40,167 ) $ 2,093,385 December 31, 2016 U.S. government corporations and agencies $ 4,716 $ 16 $ (32 ) $ 4,700 Mortgage-backed securities 1,321,760 7,026 (38,286 ) 1,290,500 Obligations of states and political subdivisions 553,020 2,436 (19,312 ) 536,144 Total debt securities 1,879,496 9,478 (57,630 ) 1,831,344 Equity securities 14,451 69 — 14,520 Total $ 1,893,947 $ 9,547 $ (57,630 ) $ 1,845,864 The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of September 30, 2017 , and December 31, 2016 , are summarized in the table below, in thousands: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2017 Obligations of states and political subdivisions $ 256,355 $ 14,722 $ (691 ) $ 270,386 Total $ 256,355 $ 14,722 $ (691 ) $ 270,386 December 31, 2016 Obligations of states and political subdivisions $ 263,662 $ 12,282 $ (1,145 ) $ 274,799 Total $ 263,662 $ 12,282 $ (1,145 ) $ 274,799 At September 30, 2017 , approximately 74% of Heartland's mortgage-backed securities were issued by government-sponsored enterprises. The amortized cost and estimated fair value of debt securities available for sale at September 30, 2017 , by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. September 30, 2017 Amortized Cost Estimated Fair Value Due in 1 year or less $ 185 $ 186 Due in 1 to 5 years 40,716 41,077 Due in 5 to 10 years 93,240 91,514 Due after 10 years 380,161 378,612 Total debt securities 514,302 511,389 Mortgage-backed securities 1,593,677 1,565,400 Equity securities 16,253 16,596 Total investment securities $ 2,124,232 $ 2,093,385 The amortized cost and estimated fair value of debt securities held to maturity at September 30, 2017 , by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. September 30, 2017 Amortized Cost Estimated Fair Value Due in 1 year or less $ 1,510 $ 1,533 Due in 1 to 5 years 21,157 22,090 Due in 5 to 10 years 105,030 109,119 Due after 10 years 128,658 137,644 Total investment securities $ 256,355 $ 270,386 As of September 30, 2017 , and December 31, 2016 , securities with a fair value of $758.1 million and $810.6 million , respectively, were pledged to secure public and trust deposits, short-term borrowings and for other purposes as required or permitted by law. Gross gains and losses realized related to the sales of securities available for sale for the three- and nine- month periods ended September 30, 2017 and 2016 , are summarized as follows, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Proceeds from sales $ 503,083 $ 146,242 $ 1,127,091 $ 768,617 Gross security gains 2,088 1,763 8,585 11,416 Gross security losses 409 177 3,023 1,332 The following tables summarize, in thousands, the amount of unrealized losses, defined as the amount by which cost or amortized cost exceeds fair value, and the related fair value of investments with unrealized losses in Heartland's securities portfolio as of September 30, 2017 , and December 31, 2016 . The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or more. The reference point for determining how long an investment was in an unrealized loss position w as September 30, 2016 , and December 31, 2015 , respectively. Securities for which Heartland has taken credit-related other-than-temporary impairment ("OTTI") write-downs are categorized as being "less than 12 months" or "12 months or longer" in a continuous loss position based on the point in time that the fair value declined to below the cost basis and not the period of time since the credit-related OTTI write-down. Securities available for sale Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 U.S. government corporations and agencies $ 6,901 $ (34 ) $ — $ — $ 6,901 $ (34 ) Mortgage-backed securities 761,235 (11,558 ) 431,669 (21,375 ) 1,192,904 (32,933 ) Obligations of states and political subdivisions 149,931 (1,820 ) 153,068 (5,380 ) 302,999 (7,200 ) Total debt securities 918,067 (13,412 ) 584,737 (26,755 ) 1,502,804 (40,167 ) Equity securities — — — — — — Total temporarily impaired securities $ 918,067 $ (13,412 ) $ 584,737 $ (26,755 ) $ 1,502,804 $ (40,167 ) December 31, 2016 U.S. government corporations and agencies $ 4,185 $ (32 ) $ — $ — $ 4,185 $ (32 ) Mortgage-backed securities 744,202 (23,527 ) 272,449 (14,759 ) 1,016,651 (38,286 ) Obligations of states and political subdivisions 414,151 (19,309 ) 251 (3 ) 414,402 (19,312 ) Total debt securities 1,162,538 (42,868 ) 272,700 (14,762 ) 1,435,238 (57,630 ) Equity securities — — — — — — Total temporarily impaired securities $ 1,162,538 $ (42,868 ) $ 272,700 $ (14,762 ) $ 1,435,238 $ (57,630 ) Securities held to maturity Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 Obligations of states and political subdivisions $ 6,278 $ (43 ) $ 8,894 $ (648 ) $ 15,172 $ (691 ) Total temporarily impaired securities $ 6,278 $ (43 ) $ 8,894 $ (648 ) $ 15,172 $ (691 ) December 31, 2016 Obligations of states and political subdivisions $ 31,479 $ (884 ) $ 2,017 $ (261 ) $ 33,496 $ (1,145 ) Total temporarily impaired securities $ 31,479 $ (884 ) $ 2,017 $ (261 ) $ 33,496 $ (1,145 ) Heartland reviews the investment securities portfolio on a quarterly basis to monitor its exposure to OTTI. A determination as to whether a security's decline in fair value is other-than-temporary takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors Heartland may consider in the OTTI analysis include the length of time the security has been in an unrealized loss position, changes in security ratings, financial condition of the issuer, as well as security and industry specific economic conditions. In addition, with regard to debt securities, Heartland may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds and the value of any underlying collateral. For certain debt securities in unrealized loss positions, Heartland prepares cash flow analyses to compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. The remaining unrealized losses on Heartland's mortgage-backed securities are the result of changes in market interest rates or widening of market spreads subsequent to the initial purchase of the securities. The losses are not related to concerns regarding the underlying credit of the issuers or the underlying collateral. It is expected that the securities will not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates or widening market spreads and not credit quality, and because Heartland has the intent and ability to hold these investments until a market price recovery or to maturity and does not believe it will be required to sell the securities before maturity, these investments are not considered other-than-temporarily impaired. The remaining unrealized losses on Heartland's obligations of states and political subdivisions are the result of changes in market interest rates or widening of market spreads subsequent to the initial purchase of the securities. Management monitors the published credit ratings of these securities and the stability of the underlying municipalities. Because the decline in fair value is attributable to changes in interest rates or widening market spreads due to insurance company downgrades and not underlying credit quality, and because Heartland has the intent and ability to hold these investments until a market price recovery or to maturity and does not believe it will be required to sell the securities before maturity, these investments are not considered other-than-temporarily impaired. There were no available for sale or held to maturity securities with OTTI write-downs held as of or for the nine-month period ended September 30, 2017. There were no gross realized gains and $85,000 of gross realized losses on the sale of available for sale securities with OTTI writedowns for the nine-month period ended September 30, 2016 . Additionally, there were no gross realized gains and $439,000 of gross realized losses on the sale of held to maturity securities with OTTI write-downs for the nine-month period ended September 30, 2016 . The following table shows the detail of OTTI write-downs on debt securities included in earnings and the related changes in other accumulated comprehensive income ("AOCI") for the same securities, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Recorded as part of gross realized losses: Credit related OTTI $ — $ — $ — $ — Intent to sell OTTI — — — — Total recorded as part of gross realized losses — — — — Recorded directly to AOCI for non-credit related impairment: Residential mortgage backed securities — — — — Reduction of non-credit related impairment related to security sales — — — (120 ) Accretion of non-credit related impairment — — — (7 ) Total changes to AOCI for non-credit related impairment — — — (127 ) Total OTTI losses (accretion) recorded on debt securities, net $ — $ — $ — $ (127 ) Included in other securities at September 30, 2017 , and December 31, 2016 , were shares of stock in the Federal Home Loan Banks (the "FHLBs") of Des Moines, Chicago, Dallas, San Francisco and Topeka at an amortized cost of $14.0 million and $ 14.4 million , respectively. The Heartland banks are required by federal law to maintain FHLB stock as members of the various FHLBs. These equity securities are "restricted" in that they can only be sold back to the respective institutions from which they were acquired or another member institution at par. Therefore, the FHLB stock is less liquid than other marketable equity securities, and the fair value approximates amortized cost. Heartland considers its FHLB stock as a long-term investment that provides access to competitive products and liquidity. Heartland evaluates impairment in these investments based on the ultimate recoverability of the par value and, at September 30, 2017 , did not consider the investments to be other than temporarily impaired.

Loans

Loans	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans	LOANS Loans as of September 30, 2017 , and December 31, 2016 , were as follows, in thousands: September 30, 2017 December 31, 2016 Loans receivable held to maturity: Commercial $ 1,613,903 $ 1,287,265 Commercial real estate 3,163,953 2,538,582 Agricultural and agricultural real estate 511,764 489,318 Residential real estate 635,611 617,924 Consumer 450,088 420,613 Gross loans receivable held to maturity 6,375,319 5,353,702 Unearned discount (605 ) (699 ) Deferred loan fees (1,299 ) (1,284 ) Total net loans receivable held to maturity 6,373,415 5,351,719 Allowance for loan losses (54,885 ) (54,324 ) Loans receivable, net $ 6,318,530 $ 5,297,395 Heartland has certain lending policies and procedures in place that are designed to provide for an acceptable level of credit risk. The board of directors reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management and the board with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies, nonperforming loans and potential problem loans. Diversification in the loan portfolio is also a means of managing risk associated with fluctuations in economic conditions. The commercial and commercial real estate loan portfolio includes a wide range of business loans, including lines of credit for working capital and operational purposes and term loans for the acquisition of equipment and real estate. Although most loans are made on a secured basis, loans may be made on an unsecured basis if warranted by the overall financial condition of the borrower. Terms of commercial business loans generally range from one to five years. Commercial loans are primarily made based on the identified cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The collateral that Heartland requires for most of these loans is based upon the discounted market value of the collateral. The primary repayment risks of commercial loans are that the cash flow of the borrowers may be unpredictable, and the collateral securing these loans may fluctuate in value. Heartland seeks to minimize these risks in a variety of ways. The underwriting analysis includes credit verification, analysis of global cash flows, appraisals and a review of the financial condition of the borrower. Personal guarantees are frequently required as a tertiary form of repayment. In addition, when underwriting loans for commercial real estate, careful consideration is given to the property's operating history, future operating projections, current and projected occupancy, location and physical condition. Heartland also utilizes government guaranteed lending through the U.S. Small Business Administration and the U.S. Department of Agriculture's Rural Development Business and Industry Program to assist customers with longer-term funding and to reduce risk. Agricultural loans, many of which are secured by crops, machinery and real estate, are provided to finance capital improvements and farm operations as well as acquisitions of livestock and machinery. Agricultural loans present unique credit risks relating to adverse weather conditions, loss of livestock due to disease or other reasons, declines in market prices for agricultural products and the impact of government regulations. The ultimate repayment of agricultural loans is dependent upon the profitable operation or management of the agricultural entity. In underwriting agricultural loans, lending personnel work closely with their customers to review budgets and cash flow projections for crop production for the ensuing year. These budgets and cash flow projections are monitored closely during the year and reviewed with the customers at least annually. Lending personnel also work closely with governmental agencies, including the Farm Service Agency, to help agricultural customers obtain credit enhancement products such as loan guarantees or interest assistance. Heartland originates first-lien, adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a single family residential property. These loans are principally collateralized by owner-occupied properties and are amortized over 10 to 30 years. Heartland typically sells longer-term, low-rate, residential mortgage loans in the secondary market with servicing rights retained. This practice allows Heartland to better manage interest rate risk and liquidity risk. The Heartland bank subsidiaries participate in lending programs sponsored by U.S. government agencies such as Veterans Administration and Federal Home Administration when justified by market conditions. As of September 30, 2017 , Heartland had $4.8 million of loans secured by residential real estate property that were in the process of foreclosure. Consumer lending includes motor vehicle, home improvement, home equity and small personal credit lines. Consumer loans typically have shorter terms, lower balances, higher yields and higher risks of default than one-to-four-family residential mortgage loans. Consumer loan collections are dependent on the borrower's continuing financial stability, and are therefore more likely to be affected by adverse personal circumstances. Risk is reduced through underwriting criteria, which include credit verification, appraisals, a review of the borrower's financial condition, and personal cash flows. A security interest, with title insurance when necessary, is taken in the underlying real estate. Heartland's consumer finance subsidiaries, Citizens Finance Co. and Citizens Finance of Illinois Co., typically lend to borrowers with past credit problems or limited credit histories, and these loans comprise approximately 17% of Heartland's total consumer loan portfolio. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Heartland’s policy is to discontinue the accrual of interest income on any loan when, in the opinion of management, there is a reasonable doubt as to the timely collection of the interest and principal, normally when a loan is 90 days past due. When interest accruals are deemed uncollectible, interest credited to income in the current year is reversed and interest accrued in prior years is charged to the allowance for loan losses. Nonaccrual loans are returned to an accrual status when, in the opinion of management, the financial position of the borrower indicates that there is no longer any reasonable doubt as to the timely payment of interest and principal. Under Heartland’s credit practices, a loan is impaired when, based on current information and events, it is probable that Heartland will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loan impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except where more practical, impairment is measured at the observable market price of the loan or the fair value of the collateral if the loan is collateral dependent. The following table shows the balance in the allowance for loan losses at September 30, 2017 , and December 31, 2016 , and the related loan balances, disaggregated on the basis of impairment methodology, in thousands. Loans evaluated under ASC 310-10-35 include loans on nonaccrual status and troubled debt restructurings, which are individually evaluated for impairment, and other impaired loans deemed to have similar risk characteristics. All other loans are collectively evaluated for impairment under ASC 450-20. Heartland has made no significant changes to the accounting for the allowance for loan losses during 2017. Allowance For Loan Losses Gross Loans Receivable Held to Maturity Ending Balance Under ASC 310-10-35 Ending Balance Under ASC 450-20 Total Ending Balance Evaluated for Impairment Under ASC 310-10-35 Ending Balance Evaluated for Impairment Under ASC 450-20 Total September 30, 2017 Commercial $ 2,166 $ 14,804 $ 16,970 $ 6,957 $ 1,606,946 $ 1,613,903 Commercial real estate 864 19,676 20,540 27,943 3,136,010 3,163,953 Agricultural and agricultural real estate 2,353 3,774 6,127 12,792 498,972 511,764 Residential real estate 393 1,873 2,266 29,833 605,778 635,611 Consumer 1,267 7,715 8,982 6,524 443,564 450,088 Total $ 7,043 $ 47,842 $ 54,885 $ 84,049 $ 6,291,270 $ 6,375,319 December 31, 2016 Commercial $ 1,318 $ 13,447 $ 14,765 $ 3,712 $ 1,283,553 $ 1,287,265 Commercial real estate 2,671 21,648 24,319 45,217 2,493,365 2,538,582 Agricultural and agricultural real estate 816 3,394 4,210 16,730 472,588 489,318 Residential real estate 497 1,766 2,263 25,726 592,198 617,924 Consumer 1,451 7,316 8,767 5,988 414,625 420,613 Total $ 6,753 $ 47,571 $ 54,324 $ 97,373 $ 5,256,329 $ 5,353,702 The following table presents nonaccrual loans, accruing loans past due 90 days or more and troubled debt restructured loans at September 30, 2017 , and December 31, 2016 , in thousands: September 30, 2017 December 31, 2016 Nonaccrual loans $ 59,451 $ 62,591 Nonaccrual troubled debt restructured loans 4,005 1,708 Total nonaccrual loans $ 63,456 $ 64,299 Accruing loans past due 90 days or more $ 2,348 $ 86 Performing troubled debt restructured loans $ 10,040 $ 10,380 The following tables provide information on troubled debt restructured loans that were modified during the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , dollars in thousands: Three Months Ended 2017 2016 Number Pre- Post- Number Pre- Post- Commercial — $ — $ — — $ — $ — Commercial real estate — — — — — — Total commercial and commercial real estate — — — — — — Agricultural and agricultural real estate — — — — — — Residential real estate 8 1,174 1,174 5 651 651 Consumer — — — — — — Total 8 $ 1,174 $ 1,174 5 $ 651 $ 651 Nine Months Ended 2017 2016 Number of Loans Pre- Modification Recorded Investment Post- Modification Recorded Investment Number of Loans Pre- Modification Recorded Investment Post- Modification Recorded Investment Commercial 3 $ 131 $ 131 1 $ 100 $ 100 Commercial real estate — — — 1 179 179 Total commercial and commercial real estate 3 131 131 2 279 279 Agricultural and agricultural real estate — — — — — — Residential real estate 22 2,977 2,977 5 651 651 Consumer — — — — — — Total 25 $ 3,108 $ 3,108 7 $ 930 $ 930 The pre-modification and post-modification recorded investment represents amounts as of the date of loan modification. Since the modifications of these loans have been only interest rate concessions and term extensions, not principal reductions, the pre-modification and post-modification recorded investment amounts are the same. At September 30, 2017 , there were no commitments to extend credit to any of the borrowers with an existing troubled debt restructuring. The following table shows troubled debt restructured loans for which there was a payment default during the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , that had been modified during the twelve-month period prior to default, in thousands: With Payment Defaults During the Following Periods Three Months Ended 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial — $ — — $ — Commercial real estate — — — — Total commercial and commercial real estate — — — — Agricultural and agricultural real estate — — — — Residential real estate 5 1,221 — — Consumer — — — — Total 5 $ 1,221 — $ — With Payment Defaults During the Following Periods Nine Months Ended 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial — $ — 1 $ 95 Commercial real estate — — — — Total commercial and commercial real estate — — 1 95 Agricultural and agricultural real estate — — — — Residential real estate 8 1,480 — — Consumer — — — — Total 8 $ 1,480 1 $ 95 Heartland's internal rating system is a series of grades reflecting management's risk assessment, based on its analysis of the borrower's financial condition. The "pass" category consists of all loans that are not in the "nonpass" category, categorized into a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the pass category is monitored for early identification of credit deterioration. The "nonpass" category consists of special mention, substandard, doubtful and loss loans. The "special mention" rating is attached to loans where the borrower exhibits negative trends in financial circumstances due to borrower specific or systemic conditions that, if left uncorrected, threaten the borrower's capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. These credits are closely monitored for improvement or deterioration. The "substandard" rating is assigned to loans that are inadequately protected by the current net worth and paying capacity of the borrower and that may be further at risk due to deterioration in the value of collateral pledged. Well-defined weaknesses jeopardize liquidation of the debt. These loans are still considered collectible; however, a distinct possibility exists that Heartland will sustain some loss if deficiencies are not corrected. Substandard loans may exhibit some or all of the following weaknesses: deteriorating financial trends, lack of earnings, inadequate debt service capacity, excessive debt and/or lack of liquidity. The "doubtful" rating is assigned to loans where identified weaknesses in the borrowers' ability to repay the loan make collection or liquidation in full, on the basis of existing facts, conditions and values, highly questionable and improbable. These borrowers are usually in default, lack liquidity and capital, as well as resources necessary to remain as an operating entity. Specific pending events, such as capital injections, liquidations or perfection of liens on additional collateral, may strengthen the credit, thus deferring the rating of the loan as "loss" until the exact status of the loan can be determined. The loss rating is assigned to loans considered uncollectible. As of September 30, 2017, Heartland had one loan relationship with a gross balance of $9.6 million included in the balance of gross loans receivable held to maturity, of which $2.2 million is classified as a loss. Included in the ASC 310-10-35 portion of the allowance as of September 30, 2017, is a $2.2 million specific reserve associated with this loan relationship. Heartland had no loans classified as doubtful as of September 30, 2017. Loans are placed on "nonaccrual" when management does not expect to collect payments of principal and interest in full or when principal or interest has been in default for a period of 90 days or more, unless the loan is both well secured and in the process of collection. The following table presents loans by credit quality indicator at September 30, 2017 , and December 31, 2016 , in thousands: Pass Nonpass Total September 30, 2017 Commercial $ 1,523,080 $ 90,823 $ 1,613,903 Commercial real estate 2,992,663 171,290 3,163,953 Total commercial and commercial real estate 4,515,743 262,113 4,777,856 Agricultural and agricultural real estate 445,554 66,210 511,764 Residential real estate 597,987 37,624 635,611 Consumer 437,831 12,257 450,088 Total gross loans receivable held to maturity $ 5,997,115 $ 378,204 $ 6,375,319 December 31, 2016 Commercial $ 1,187,557 $ 99,708 $ 1,287,265 Commercial real estate 2,379,632 158,950 2,538,582 Total commercial and commercial real estate 3,567,189 258,658 3,825,847 Agricultural and agricultural real estate 424,311 65,007 489,318 Residential real estate 584,626 33,298 617,924 Consumer 409,474 11,139 420,613 Total gross loans receivable held to maturity $ 4,985,600 $ 368,102 $ 5,353,702 The nonpass category in the table above is comprised of approximately 48% special mention loans and 52% substandard loans as of September 30, 2017 . The percent of nonpass loans on nonaccrual status as of September 30, 2017 , was 17% . As of December 31, 2016 , the nonpass category in the table above was comprised of approximately 47% special mention loans and 53% substandard loans. The percent of nonpass loans on nonaccrual status as of December 31, 2016 , was 17% . Loans delinquent 30 to 89 days as a percent of total loans were 0.33% at September 30, 2017 , compared to 0 .37% at December 31, 2016 . Changes in credit risk are monitored on a regular basis and changes in risk ratings are made when identified. All impaired loans are reviewed at least annually. The following table sets forth information regarding Heartland's accruing and nonaccrual loans at September 30, 2017 , and December 31, 2016 , in thousands: Accruing Loans 30-59 Days Past Due 60-89 Days 90 Days or More Past Due Total Past Due Current Nonaccrual Total Loans September 30, 2017 Commercial $ 2,591 $ 133 $ 215 $ 2,939 $ 1,603,397 $ 7,567 $ 1,613,903 Commercial real estate 6,140 465 — 6,605 3,140,672 16,676 3,163,953 Total commercial and commercial real estate 8,731 598 215 9,544 4,744,069 24,243 4,777,856 Agricultural and agricultural real estate 315 782 1,282 2,379 496,593 12,792 511,764 Residential real estate 5,033 449 — 5,482 607,165 22,964 635,611 Consumer 3,001 1,813 851 5,665 440,966 3,457 450,088 Total gross loans receivable held to maturity $ 17,080 $ 3,642 $ 2,348 $ 23,070 $ 6,288,793 $ 63,456 $ 6,375,319 December 31, 2016 Commercial $ 1,127 $ 219 $ 77 $ 1,423 $ 1,281,241 $ 4,601 $ 1,287,265 Commercial real estate 886 3,929 — 4,815 2,513,069 20,698 2,538,582 Total commercial and commercial real estate 2,013 4,148 77 6,238 3,794,310 25,299 3,825,847 Agricultural and agricultural real estate 199 3,191 — 3,390 472,597 13,331 489,318 Residential real estate 4,986 846 — 5,832 590,626 21,466 617,924 Consumer 3,455 1,021 9 4,485 411,925 4,203 420,613 Total gross loans receivable held to maturity $ 10,653 $ 9,206 $ 86 $ 19,945 $ 5,269,458 $ 64,299 $ 5,353,702 The majority of Heartland's impaired loans are on nonaccrual or have had their terms restructured in a troubled debt restructuring. The following tables present, by category of loan, impaired loans, the unpaid contractual loan balances at September 30, 2017 , and December 31, 2016 ; the outstanding loan balances recorded on the consolidated balance sheets at September 30, 2017 , and December 31, 2016 ; any related allowance recorded for those loans as of September 30, 2017 , and December 31, 2016 ; the average outstanding loan balances recorded on the consolidated balance sheets during the three- and nine- months ended September 30, 2017 , and year ended December 31, 2016 ; and the interest income recognized on the impaired loans during the three- and nine- month periods ended September 30, 2017 , and year ended December 31, 2016 , in thousands: Unpaid Contractual Balance Loan Balance Related Allowance Recorded Quarter- to- Date Avg. Loan Balance Quarter- to- Date Interest Income Recognized Year- to- Date Avg. Loan Balance Year- to- Date Interest Income Recognized September 30, 2017 Impaired loans with a related allowance: Commercial $ 3,190 $ 3,190 $ 2,166 $ 4,885 $ — $ 3,829 $ 1 Commercial real estate 11,272 9,416 864 10,637 — 12,106 7 Total commercial and commercial real estate 14,462 12,606 3,030 15,522 — 15,935 8 Agricultural and agricultural real estate 10,289 10,289 2,353 3,532 — 2,140 — Residential real estate 1,640 1,640 393 1,633 — 2,197 10 Consumer 2,179 2,179 1,267 2,155 10 2,343 32 Total impaired loans with a related allowance $ 28,570 $ 26,714 $ 7,043 $ 22,842 $ 10 $ 22,615 $ 50 Impaired loans without a related allowance: Commercial $ 4,887 $ 3,767 $ — $ 2,727 $ — $ 2,017 $ 112 Commercial real estate 19,132 18,527 — 18,237 201 21,750 536 Total commercial and commercial real estate 24,019 22,294 — 20,964 201 23,767 648 Agricultural and agricultural real estate 2,503 2,503 — 8,343 — 10,858 — Residential real estate 28,197 28,193 — 27,556 112 26,006 230 Consumer 4,345 4,345 — 4,222 19 3,849 61 Total impaired loans without a related allowance $ 59,064 $ 57,335 $ — $ 61,085 $ 332 $ 64,480 $ 939 Total impaired loans held to maturity: Commercial $ 8,077 $ 6,957 $ 2,166 $ 7,612 $ — $ 5,846 $ 113 Commercial real estate 30,404 27,943 864 28,874 201 33,856 543 Total commercial and commercial real estate 38,481 34,900 3,030 36,486 201 39,702 656 Agricultural and agricultural real estate 12,792 12,792 2,353 11,875 — 12,998 — Residential real estate 29,837 29,833 393 29,189 112 28,203 240 Consumer 6,524 6,524 1,267 6,377 29 6,192 93 Total impaired loans held to maturity $ 87,634 $ 84,049 $ 7,043 $ 83,927 $ 342 $ 87,095 $ 989 Unpaid Contractual Balance Loan Balance Related Allowance Recorded Year-to- Date Avg. Loan Balance Year-to- Date Interest Income Recognized December 31, 2016 Impaired loans with a related allowance: Commercial $ 2,852 $ 2,840 $ 1,318 $ 3,136 $ 2 Commercial real estate 14,221 14,221 2,671 10,625 21 Total commercial and commercial real estate 17,073 17,061 3,989 13,761 23 Agricultural and agricultural real estate 2,771 2,771 816 912 21 Residential real estate 3,490 3,490 497 3,371 43 Consumer 2,644 2,644 1,451 3,082 42 Total impaired loans with a related allowance $ 25,978 $ 25,966 $ 6,753 $ 21,126 $ 129 Impaired loans without a related allowance: Commercial $ 925 $ 872 $ — $ 5,329 $ 251 Commercial real estate 31,875 30,996 — 39,632 1,647 Total commercial and commercial real estate 32,800 31,868 — 44,961 1,898 Agricultural and agricultural real estate 13,959 13,959 — 12,722 157 Residential real estate 22,408 22,236 — 18,446 202 Consumer 3,344 3,344 — 2,659 68 Total impaired loans without a related allowance $ 72,511 $ 71,407 $ — $ 78,788 $ 2,325 Total impaired loans held to maturity: Commercial $ 3,777 $ 3,712 $ 1,318 $ 8,465 $ 253 Commercial real estate 46,096 45,217 2,671 50,257 1,668 Total commercial and commercial real estate 49,873 48,929 3,989 58,722 1,921 Agricultural and agricultural real estate 16,730 16,730 816 13,634 178 Residential real estate 25,898 25,726 497 21,817 245 Consumer 5,988 5,988 1,451 5,741 110 Total impaired loans held to maturity $ 98,489 $ 97,373 $ 6,753 $ 99,914 $ 2,454 On July 7, 2017, Heartland acquired Citywide Banks of Colorado, Inc., parent company of Citywide Banks, based in Denver, Colorado. As of July 7, 2017, Citywide Banks had gross loans of $1.00 billion , and the estimated fair value of the loans acquired was $985.4 million . On February 28, 2017, Heartland acquired Founders Bancorp, parent company of Founders Community Bank, based in San Luis Obispo, California. As of February 28, 2017, Founders Community Bank had gross loans of $98.9 million , and the estimated fair value of the loans acquired was $96.4 million . On February 5, 2016, Heartland acquired CIC Bancshares, Inc., parent company of Centennial Bank, in Denver, Colorado. As of February 5, 2016, Centennial Bank had gross loans of $ 594.9 million , and the estimated fair value of the loans acquired was $ 581.5 million . Heartland uses the acquisition method of accounting for purchased loans in accordance with ASC 805, " Business Combinations." Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date, but the purchaser cannot carry over the related allowance for loan losses. Purchased loans are accounted for under ASC 310-30, " Loans and Debt Securities with Deteriorated Credit Quality," when the loans have evidence of credit deterioration since origination, and when at the date of the acquisition, it is probable that Heartland will not collect all contractually required principal and interest payments. Evidence of credit quality deterioration at the purchase date includes statistics such as past due and nonaccrual status. Generally, acquired loans that meet Heartland’s definition for nonaccrual status fall within the scope of ASC 310-30. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference, which is included in the carrying value of the loans. Subsequent decreases to the expected cash flows of the loan will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges, or a reclassification of the difference from nonaccretable to accretable with a positive impact on future interest income. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. At September 30, 2017 , and December 31, 2016 , the carrying amount of loans acquired since 2015 consist of purchased impaired and nonimpaired loans as summarized in the following table, in thousands: September 30, 2017 December 31, 2016 Impaired Non Impaired Total Loans Impaired Non Impaired Total Loans Commercial $ 968 $ 270,241 $ 271,209 $ 2,198 $ 99,082 $ 101,280 Commercial real estate 2,509 1,181,333 1,183,842 2,079 622,117 624,196 Agricultural and agricultural real estate — 1,251 1,251 — 181 181 Residential real estate 211 184,167 184,378 186 157,468 157,654 Consumer loans — 62,491 62,491 — 47,368 47,368 Total loans $ 3,688 $ 1,699,483 $ 1,703,171 $ 4,463 $ 926,216 $ 930,679 Changes in accretable yield on acquired loans with evidence of credit deterioration at the date of acquisition for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , were as follows, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Balance at beginning of period $ 101 $ 168 $ 182 $ 557 Original yield discount, net, at date of acquisitions — — — 19 Accretion (700 ) (379 ) (1,074 ) (845 ) Reclassification from nonaccretable difference (1) 654 331 947 389 Balance at period end $ 55 $ 120 $ 55 $ 120 (1) Represents increases in estimated cash flows expected to be received, primarily due to lower estimated credit losses. For loans acquired since January 2015, on the acquisition dates the preliminary estimate of the contractually required payments receivable for all loans with evidence of credit deterioration since origination was $22.2 million , and the estimated fair value of these loans was $13.1 million . At September 30, 2017 , a majority of these loans were valued based upon the liquidation value of the underlying collateral, because the expected cash flows are primarily based on the liquidation of such collateral, and the timing and amount of the cash flows could not be reasonably estimated. At September 30, 2017 , and December 31, 2016 , there was an allowance for loan losses of $ 132,000 and $588,000 , respectively, related to these ASC 310-30 loans. Provision expense of $ 4,000 and $126,000 was recorded for the three-month periods ended September 30, 2017 , and 2016 , respectively. Provision expense of $5,000 and $517,000 was recorded for the nine-month periods ended September 30, 2017, and 2016, respectively. For loans acquired since January 2015, the preliminary estimate on the acquisition dates of the contractually required payments receivable for all nonimpaired loans acquired was $2.66 billion , and the estimated fair value of the loans was $2.59 billion .

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Allowance for Loan Losses	ALLOWANCE FOR LOAN LOSSES Changes in the allowance for loan losses for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , were as follows, in thousands: Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at June 30, 2017 $ 17,168 $ 21,861 $ 3,832 $ 2,263 $ 8,927 $ 54,051 Charge-offs (1,954 ) (1,913 ) — (142 ) (1,750 ) (5,759 ) Recoveries 347 46 14 63 418 888 Provision 1,409 546 2,281 82 1,387 5,705 Balance at September 30, 2017 $ 16,970 $ 20,540 $ 6,127 $ 2,266 $ 8,982 $ 54,885 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at December 31, 2016 $ 14,765 $ 24,319 $ 4,210 $ 2,263 $ 8,767 $ 54,324 Charge-offs (3,310 ) (2,522 ) (888 ) (541 ) (4,982 ) (12,243 ) Recoveries 635 860 17 70 987 2,569 Provision 4,880 (2,117 ) 2,788 474 4,210 10,235 Balance at September 30, 2017 $ 16,970 $ 20,540 $ 6,127 $ 2,266 $ 8,982 $ 54,885 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at June 30, 2016 $ 15,525 $ 22,968 $ 4,100 $ 2,065 $ 7,098 $ 51,756 Charge-offs (240 ) (814 ) — (106 ) (2,123 ) (3,283 ) Recoveries 119 467 2 1 263 852 Provision 1,487 1,060 904 22 1,855 5,328 Balance at September 30, 2016 $ 16,891 $ 23,681 $ 5,006 $ 1,982 $ 7,093 $ 54,653 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at December 31, 2015 $ 16,095 $ 19,532 $ 3,887 $ 1,934 $ 7,237 $ 48,685 Charge-offs (587 ) (2,229 ) — (248 ) (4,775 ) (7,839 ) Recoveries 438 3,056 9 25 766 4,294 Provision 945 3,322 1,110 271 3,865 9,513 Balance at September 30, 2016 $ 16,891 $ 23,681 $ 5,006 $ 1,982 $ 7,093 $ 54,653 Management allocates the allowance for loan losses by pools of risk within each loan portfolio. The allocation of the allowance for loan losses by loan portfolio is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio.

Goodwill, Core Deposit Premium

Goodwill, Core Deposit Premium and Other Intangible Assets	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Core Deposit Premium and Other Intangible Assets	GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS Heartland had goodwill of $ 236.6 million at September 30, 2017 , and $127.7 million at December 31, 2016 . Heartland conducts its annual internal assessment of the goodwill both at the consolidated level and at its subsidiaries as of September 30. There was no goodwill impairment as of the most recent assessment. Heartland recorded $95.2 million of goodwill and $16.0 million of core deposit intangibles in connection with the acquisition of Citywide Banks of Colorado, Inc., parent company of Citywide Banks, headquartered in Aurora, Colorado on July 7, 2017. Heartland recorded $13.8 million of goodwill and $2.5 million of core deposit intangibles in connection with the acquisition of Founders Bancorp, parent company of Founders Community Bank, based in San Luis Obispo, California on February 28, 2017. Heartland recorded $ 29.8 million of goodwill in connection with the acquisition of CIC Bancshares, Inc., parent company of Centennial Bank, based in Denver, Colorado on February 5, 2016. In addition, Heartland recognized core deposit intangibles of $ 6.4 million and commercial servicing rights of $190,000 with this acquisition. The core deposit intangibles recorded with the Citywide Banks of Colorado, Inc., Founders Bancorp, and CIC Bancshares, Inc. acquisitions are not deductible for tax purposes and are expected to be amortized over a period of 10 years on an accelerated basis. Goodwill related to the Citywide Banks of Colorado, Inc., Founders Bancorp, and CIC Bancshares, Inc. acquisitions resulted from expected operational synergies, increased market presence, cross-selling opportunities, and expanded business lines and is not deductible for tax purposes. Heartland's intangible assets consist of core deposit intangibles, mortgage servicing rights, customer relationship intangibles, and commercial servicing rights. The gross carrying amount of these intangible assets and the associated accumulated amortization at September 30, 2017 , and December 31, 2016 , are presented in the table below, in thousands: September 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing intangible assets: Core deposit intangibles $ 62,008 $ 25,271 $ 36,737 $ 43,504 $ 21,049 $ 22,455 Customer relationship intangibles 1,177 886 291 1,177 857 320 Mortgage servicing rights 41,903 18,161 23,742 50,467 18,379 32,088 Commercial servicing rights 6,719 3,862 2,857 6,504 2,814 3,690 Total $ 111,807 $ 48,180 $ 63,627 $ 101,652 $ 43,099 $ 58,553 The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands: Core Deposit Intangibles Customer Relationship Intangibles Mortgage Servicing Rights Commercial Servicing Rights Total Three months ending December 31, 2017 $ 1,815 $ 10 $ 2,463 $ 184 $ 4,472 Year ending December 31, 2018 6,712 39 5,319 701 12,771 2019 5,915 38 4,560 566 11,079 2020 5,191 37 3,800 442 9,470 2021 4,425 35 3,040 380 7,880 2022 3,391 34 2,280 307 6,012 Thereafter 9,288 98 2,280 277 11,943 Total $ 36,737 $ 291 $ 23,742 $ 2,857 $ 63,627 Projections of amortization expense for mortgage servicing rights are based on existing asset balances and the existing interest rate environment as of September 30, 2017 . Heartland's actual experience may be significantly different depending upon changes in mortgage interest rates and market conditions. Mortgage loans serviced for others were approximately $3.56 billion and $ 4.31 billion as of September 30, 2017 , and December 31, 2016 , respectively. Custodial escrow balances maintained in connection with the mortgage loan servicing portfolio were approximately $24.3 million and $21.4 million as of September 30, 2017 , and December 31, 2016 , respectively. The fair value of Heartland's mortgage servicing rights was estimated at $35.0 million at September 30, 2017 , and $45.2 million at December 31, 2016 . Heartland's mortgage servicing rights portfolio is comprised of loans serviced for the Federal National Mortgage Association ("FNMA") and the Federal Home Loan Mortgage Corporation ("FHLMC"). Prior to the third quarter of 2017, Heartland also serviced loans for the Government National Mortgage Association ("GNMA"). The servicing rights portfolio is separated into 15 - and 30 -year tranches, and the servicing rights portfolio is an asset of one of Heartland's subsidiaries. During the third quarter of 2017, Heartland entered into an agreement to sell substantially all of its GNMA servicing portfolio, which contained loans with an unpaid principal balance of approximately $773.9 million . The transaction qualifies as a sale, and $6.9 million of mortgage servicing rights have been de-recognized on the consolidated balance sheet as of September 30, 2017. Cash of approximately $5.1 million was received during the third quarter, and Heartland recorded an estimated loss on the sale of this portfolio of approximately $183,000 . A receivable of approximately $1.6 million was recorded due to the timing of the servicing transfer per the terms of the sale agreement and to address indemnification claims and mortgage loan documentation deficiencies. The fair value of mortgage servicing rights is calculated based upon either a discounted cash flow analysis or market indication. Cash flow assumptions, including prepayment speeds, servicing costs and escrow earnings are considered in the calculation. The average constant prepayment rate was 10.93% and 9.63% for the September 30, 2017 , and December 31, 2016 , valuations, respectively. The discount rate was 9.06% and 9.26% for the September 30, 2017 , and December 31, 2016 , valuations, respectively. The average capitalization rate for the first nine months of 2017 ranged from 91 to 150 basis points compared to the range of 88 to 135 basis points for 2016 . Fees collected for the servicing of mortgage loans for others were $ 2.9 million and $ 3.1 million for the quarters ended September 30, 2017 , and September 30, 2016 , respectively and $9.3 million and $9.0 million for the nine months ended September 30, 2017 , and September 30, 2016 , respectively. The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the nine months ended September 30, 2017 , and September 30, 2016 : 2017 2016 Balance at January 1, $ 32,088 $ 30,314 Originations 5,778 9,323 Amortization (7,184 ) (7,795 ) Sale of mortgage servicing rights (6,940 ) — Balance at period end $ 23,742 $ 31,842 Fair value of mortgage servicing rights $ 35,002 $ 38,127 Mortgage servicing rights, net to servicing portfolio 0.67 % 0.75 % Heartland's commercial servicing portfolio is comprised of loans guaranteed by the Small Business Administration and United States Department of Agriculture that have been sold with servicing retained by Heartland, which totaled $144.4 million at September 30, 2017 and $164.6 million at December 31, 2016. The commercial servicing rights portfolio is separated into two tranches at the respective Heartland subsidiary, loans with a term of less than 20 years and loans with a term of more than 20 years . Fees collected for the servicing of commercial loans for others were $394,000 and $230,000 for the quarter ended September 30, 2017 , and September 30, 2016 , respectively, and $1.2 million and $685,000 for the nine months ended September 30, 2017 , and September 30, 2016 , respectively. The fair value of each commercial servicing rights portfolio is calculated based upon a discounted cash flow analysis. Cash flow assumptions, including prepayment speeds and servicing costs, are considered in the calculation. The range of average constant prepayment rates for the valuations was 6.66% to 7.99% as of September 30, 2017 , compared to 6.96% to 7.88% as of December 31, 2016 . The discount rate range was 12.52% to 14.65% for the September 30, 2017 , valuations compared to 12.44% to 13.88% for the December 31, 2016 , valuations. The capitalization rate for 2017 ranged from 310 to 445 basis points compared to 310 to 445 basis points for 2016 . The total fair value of Heartland's commercial servicing rights was estimated at $3.5 million as of September 30, 2017 , and $ 4.1 million as of December 31, 2016. The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the nine months ended September 30, 2017 , and September 30, 2016 : 2017 2016 Balance at January 1, $ 3,690 $ 4,611 Purchased commercial servicing rights — 190 Originations 215 533 Amortization (1,077 ) (1,229 ) Valuation allowance on commercial servicing rights 29 (41 ) Balance at period end $ 2,857 $ 4,064 Fair value of commercial servicing rights $ 3,458 $ 4,397 Commercial servicing rights, net to servicing portfolio 1.98 % 2.38 % Mortgage and commercial servicing rights are initially recorded at fair value in net gains on sale of loans held for sale when they are acquired through loan sales. Fair value is based on market prices for comparable servicing contracts, when available, or based on a valuation model that calculates the present value of estimated future net servicing income. Mortgage and commercial servicing rights are subsequently measured using the amortization method, which requires the asset to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Servicing rights are evaluated for impairment at each Heartland subsidiary based upon the fair value of the assets as compared to the carrying amount. Impairment is recognized through a valuation allowance for specific tranches to the extent that fair value is less than carrying amount at each Heartland subsidiary. At September 30, 2017 , no valuation allowance was required on commercial servicing rights with a term less than 20 years and a $4,000 valuation allowance was required on commercial servicing rights with a term greater than 20 years. At December 31, 2016 , no valuation allowance was required on commercial servicing rights with a term less than 20 years and a $33,000 valuation allowance was required on commercial servicing rights with a term greater than 20 years. The following table summarizes, in thousands, the book value, the fair value of each tranche of the commercial servicing rights and any recorded valuation allowance at each respective subsidiary at September 30, 2017 , and December 31, 2016 : September 30, 2017 Book Value- Less than 20 Years Fair Value- Less than 20 Years Impairment- Less than 20 Years Book Value- More than 20 Years Fair Value- More than 20 Years Impairment- More than 20 Years Citywide Banks $ 12 $ 15 $ — $ 54 $ 61 $ — Premier Valley Bank 95 124 — 317 313 4 Wisconsin Bank & Trust 515 688 — 1,868 2,257 — Total $ 622 $ 827 $ — $ 2,239 $ 2,631 $ 4 December 31, 2016 Citywide Banks $ 19 $ 23 $ — $ 107 $ 114 $ — Premier Valley Bank 156 180 — 359 326 33 Wisconsin Bank & Trust 833 997 — 2,249 2,487 — Total $ 1,008 $ 1,200 $ — $ 2,715 $ 2,927 $ 33

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS Heartland uses derivative financial instruments as part of its interest rate risk management strategy. As part of the strategy, Heartland considers the use of interest rate swaps, caps, floors, collars, and certain interest rate lock commitments and forward sales of securities related to mortgage banking activities. Heartland's current strategy includes the use of interest rate swaps, interest rate lock commitments and forward sales of mortgage securities. In addition, Heartland is facilitating back-to-back loan swaps to assist customers in managing interest rate risk. Heartland's objectives are to add stability to its net interest margin and to manage its exposure to movements in interest rates. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. Heartland is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. Heartland minimizes this risk by entering into derivative contracts with counterparties that meet Heartland’s credit standards, and the contracts contain collateral provisions protecting the at-risk party. Heartland has not experienced any losses from nonperformance by these counterparties. Heartland monitors counterparty risk in accordance with the provisions of ASC 815. In addition, interest rate-related derivative instruments generally contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits which are determined by credit ratings of each counterparty. Heartland was required to pledge $2.2 million of cash as collateral at both September 30, 2017 , and December 31, 2016 . No collateral was required to be pledged by Heartland's counterparties at both September 30, 2017 , and December 31, 2016 . Heartland's derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. See Note 8, “Fair Value,” for additional fair value information and disclosures. Cash Flow Hedges Heartland has variable rate funding which creates exposure to variability in interest payments due to changes in interest rates. To manage the interest rate risk related to the variability of interest payments, Heartland has entered into various interest rate swap agreements. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are received or made on Heartland's variable-rate liabilities. For the nine months ended September 30, 2017 , the change in net unrealized losses on cash flow hedges reflects changes in the fair value of the swaps and reclassification from accumulated other comprehensive income to interest expense totaling $1.0 million . For the next twelve months, Heartland estimates that cash payments and reclassification from accumulated other comprehensive income to interest expense will total $ 1.2 million . Heartland entered into five forward starting interest rate swap transactions to effectively convert Heartland Financial Statutory Trust IV, V, and VII, which total $ 65.0 million , as well as Morrill Statutory Trust I and II, which total $ 20.0 million , from variable rate subordinated debentures to fixed rate debt. For accounting purposes, these five swap transactions are designated as cash flow hedges of the changes in LIBOR, the benchmark interest rate being hedged, associated with the interest payments made on $85.0 million of Heartland's subordinated debentures that reset quarterly on a specified reset date. At inception, Heartland asserted that the underlying principal balance would remain outstanding throughout the hedge transaction, making it probable that sufficient LIBOR-based interest payments would exist through the maturity date of the swaps. During the first quarter of 2015, Heartland entered into two additional forward starting interest rate swaps. The first forward starting interest rate swap transaction relates to Heartland's $20.0 million Statutory Trust VI, which converted from a fixed interest rate subordinated debenture to a variable interest rate subordinated debenture effective on June 15, 2017. The forward starting swap transaction expires on June 15, 2024. The second forward starting interest rate swap was effective on March 1, 2017, and replaced the interest rate swap related to Heartland Statutory Trust VII upon its expiration on March 1, 2017. The table below identifies the balance sheet category and fair values of Heartland's derivative instruments designated as cash flow hedges at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category Receive Rate Weighted Average Pay Rate Maturity September 30, 2017 Interest rate swap $ 25,000 $ (346 ) Other liabilities 1.321 % 2.255 % 03/17/2021 Interest rate swap — — Other liabilities — % 3.220 % 03/01/2017 Interest rate swap 20,000 (828 ) Other liabilities 1.303 % 3.355 % 01/07/2020 Interest rate swap 10,000 (6 ) Other liabilities 1.329 % 1.674 % 03/26/2019 Interest rate swap 10,000 (5 ) Other liabilities 1.321 % 1.658 % 03/18/2019 Interest rate swap 35,667 557 Other assets 3.735 % 3.674 % 05/10/2021 Interest rate swap 20,000 (393 ) Other liabilities 1.320 % 2.390 % 06/15/2024 Interest rate swap 20,000 (365 ) Other liabilities 1.316 % 2.352 % 03/01/2024 December 31, 2016 Interest rate swap $ 25,000 $ (447 ) Other liabilities 0.993 % 2.255 % 03/17/2021 Interest rate swap 20,000 (114 ) Other liabilities 0.931 % 3.220 % 03/01/2017 Interest rate swap 20,000 (1,145 ) Other liabilities 0.868 % 3.355 % 01/07/2020 Interest rate swap 10,000 (42 ) Other liabilities 0.997 % 1.674 % 03/26/2019 Interest rate swap 10,000 (41 ) Other liabilities 0.993 % 1.658 % 03/18/2019 Interest rate swap 37,667 530 Other assets 3.164 % 3.674 % 05/10/2021 Interest rate swap (1) 20,000 (214 ) Other liabilities — % 2.390 % 06/15/2024 Interest rate swap (2) 20,000 (262 ) Other Liabilities — % 2.352 % 03/01/2024 (1) This swap is a forward starting swap with a weighted average pay rate of 2.390% beginning on June 15, 2017. No interest payments were required on this swap until September 15, 2017. (2) This swap is a forward starting swap with a weighted average pay rate of 2.352% beginning on March 1, 2017. No interest payments were required on this swap until June 1, 2017. The table below identifies the gains and losses recognized on Heartland's derivative instruments designated as cash flow hedges for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) Three Months Ended September 30, 2017 Interest rate swaps $ 325 Interest expense $ (308 ) Other income $ — Nine Months Ended September 30, 2017 Interest rate swaps $ 349 Interest expense $ (1,005 ) Other income $ — Three Months Ended September 30, 2016 Interest rate swaps $ 1,336 Interest expense $ (492 ) Other income $ — Nine Months Ended September 30, 2016 Interest rate swaps $ (3,160 ) Interest expense $ (1,463 ) Other income $ — Fair Value Hedges Heartland uses interest rate swaps to convert certain long term fixed rate loans to floating rates to hedge interest rate risk exposure. Heartland uses hedge accounting in accordance with ASC 815, with the unrealized gains and losses, representing the change in fair value of the derivative and the change in fair value of the risk being hedged on the related loan, being recorded in the consolidated statements of income. The ineffective portions of the unrealized gains or losses, if any, are recorded in interest income and interest expense in the consolidated statements of income. Heartland uses statistical regression to assess hedge effectiveness, both at the inception of the hedge as well as on a continual basis. The regression analysis involves regressing the periodic change in the fair value of the hedging instrument against the periodic changes in the fair value of the asset being hedged due to changes in the hedge risk. Heartland was required to pledge $4.5 million and $5.0 million of cash as collateral for these fair value hedges at September 30, 2017 , and December 31, 2016, respectively. The table below identifies the notional amount, fair value and balance sheet category of Heartland's fair value hedges at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category September 30, 2017 Fair value hedges $ 35,813 $ (1,537 ) Other liabilities December 31, 2016 Fair value hedges $ 40,807 $ (1,626 ) Other liabilities The table below identifies the gains and losses recognized on Heartland's fair value hedges for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Fair value hedges $ (63 ) Interest income Nine Months Ended September 30, 2017 Fair value hedges $ 89 Interest income Three Months Ended September 30, 2016 Fair value hedges $ (225 ) Interest income Nine Months Ended September 30, 2016 Fair value hedges $ (2,335 ) Interest income Embedded Derivatives Heartland has fixed rate loans with embedded derivatives. The loans contain terms that affect the cash flows or value of the loan similar to a derivative instrument, and therefore are considered to contain an embedded derivative. The embedded derivatives are bifurcated from the loans because the terms of the derivative instrument are not clearly and closely related to the loans. The embedded derivatives are recorded at fair value on the consolidated balance sheets as a part of other assets, and changes in the fair value are a component of noninterest income. The table below identifies the notional amount, fair value and balance sheet category of Heartland's embedded derivatives at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category September 30, 2017 Embedded derivatives $ 14,175 $ 923 Other assets December 31, 2016 Embedded derivatives $ 14,549 $ 1,104 Other assets The table below identifies the gains and losses recognized on Heartland's embedded derivatives for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Embedded derivatives $ (296 ) Other noninterest income Nine Months Ended September 30, 2017 Embedded derivatives $ (181 ) Other noninterest income Three Months Ended September 30, 2016 Embedded derivatives $ (173 ) Other noninterest income Nine Months Ended September 30, 2016 Embedded derivatives $ 243 Other noninterest income In conjunction with the CIC Bancshares, Inc. transaction on February 5, 2016, Heartland assumed convertible subordinated debt. The subordinated debt has a face value of $2.0 million , and the embedded conversion option allows the holder to convert the debt to Heartland common equity in any increment and at the discretion of the holder. The conversion option is bifurcated from the debt because the terms of the conversion option are not clearly and closely related to the terms of the debt. On February 5, 2016, the total number of shares to be issued upon conversion was 73,394 . At December 31, 2016, the remaining shares to be issued upon conversion totaled 20,481 . During 2017, all of the remaining convertible subordinated debt was converted to common stock, resulting in the issuance of 20,481 shares of common stock. The embedded conversion option was reported at fair value on the consolidated balance sheets using the Black-Scholes model. The following table identifies, in thousands, the notional amount, fair value, balance sheet category and income statement category for the change in fair value of the embedded conversion option as of September 30, 2017 , and December 31, 2016 : Notional Amount Fair Value Balance Sheet Category September 30, 2017 Embedded conversion option $ — $ — Other liabilities December 31, 2016 Embedded conversion option $ 558 $ (422 ) Other liabilities The table below identifies the gains and losses recognized on Heartland's embedded conversion options for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Embedded conversion option $ 285 Other noninterest income Nine Months Ended September 30, 2017 Embedded conversion option $ 422 Other noninterest income Three Months Ended September 30, 2016 Embedded conversion option $ 435 Other noninterest income Nine Months Ended September 30, 2016 Embedded conversion option $ 138 Other noninterest income Back-to-Back Loan Swaps Heartland has interest rate swap loan relationships with customers to meet their financing needs. Upon entering into these loan swaps, Heartland enters into offsetting positions with counterparties in order to minimize interest rate risk. These back-to-back loan swaps qualify as free standing financial derivatives with the fair values reported in other assets and other liabilities on the consolidated balance sheets. Heartland was required to post $2.0 million and $1.8 million at both September 30, 2017 , and December 31, 2016 , respectively, as collateral related to these back-to-back swaps. Heartland's counterparties were required to pledge $190,000 at September 30, 2017 , and $768,000 at December 31, 2016 . Any gains and losses on these back-to-back swaps are recorded in noninterest income on the consolidated statements of income, and for the nine months ended September 30, 2017 and September 30, 2016 , no gain or loss was recognized. The table below identifies the balance sheet category and fair values of Heartland's derivative instruments designated as loan swaps at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate September 30, 2017 Customer interest rate swaps $ 90,370 $ 1,906 Other assets 4.75 % 3.91 % Customer interest rate swaps 90,370 (1,906 ) Other liabilities 3.91 % 4.75 % December 31, 2016 Customer interest rate swaps $ 69,594 $ 1,588 Other assets 4.66 % 3.47 % Customer interest rate swaps 69,594 (1,588 ) Other liabilities 3.47 % 4.66 % Other Free Standing Derivatives Heartland has entered into interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans and mortgage backed securities that are considered derivative instruments. Heartland enters into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on the commitments to fund the loans as well as on residential mortgage loans available for sale. The fair value of these commitments is recorded on the consolidated balance sheets, with the changes in fair value recorded in the consolidated statements of income as a component of gains on sale of loans held for sale. These derivative contracts are designated as free standing derivative contracts and are not designated against specific assets and liabilities on the consolidated balance sheets or forecasted transactions and therefore do not qualify for hedge accounting treatment. Heartland was required to pledge collateral of $353,000 at September 30, 2017 , and $0 at December 31, 2016 . Heartland's counterparties were required to pledge $29,000 and $2.9 million at September 30, 2017 , and December 31, 2016 , respectively, as collateral for these forward commitments. Heartland acquired undesignated interest rate swaps in 2015. These swaps were entered into primarily for the benefit of customers seeking to manage their interest rate risk and are not designated against specific assets or liabilities on the consolidated balance sheet or forecasted transactions and therefore do not qualify for hedge accounting in accordance with ASC 815. These swaps are carried at fair value on the consolidated balance sheets as a component of other liabilities, with changes in the fair value recorded as a component of other noninterest income. The table below identifies the balance sheet category and fair values of Heartland's other free standing derivative instruments not designated as hedging instruments at September 30, 2017 , and December 31, 2016 , in thousands: Balance Sheet Category Notional Amount Fair Value September 30, 2017 Interest rate lock commitments (mortgage) Other assets $ 77,910 $ 2,463 Forward commitments Other assets 75,192 237 Forward commitments Other liabilities 91,865 (261 ) Undesignated interest rate swaps Other liabilities 14,175 (923 ) December 31, 2016 Interest rate lock commitments (mortgage) Other assets $ 80,465 $ 2,790 Forward commitments Other assets 142,750 2,546 Forward commitments Other liabilities 59,276 (266 ) Undesignated interest rate swaps Other liabilities 15,564 (1,126 ) The table below identifies the income statement category of the gains and losses recognized in income on Heartland's other free standing derivative instruments not designated as hedging instruments for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Income Statement Category Gain (Loss) Recognized Three Months Ended September 30, 2017 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,245 ) Forward commitments Net gains on sale of loans held for sale 72 Undesignated interest rate swaps Other noninterest income 88 Nine Months Ended September 30, 2017 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (587 ) Forward commitments Net gains on sale of loans held for sale (2,304 ) Undesignated interest rate swaps Other noninterest income 203 Three Months Ended September 30, 2016 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,344 ) Forward commitments Net gains on sale of loans held for sale 931 Undesignated interest rate swaps Other noninterest income 269 Nine Months Ended September 30, 2016 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ 4,464 Forward commitments Net gains on sale of loans held for sale (1,311 ) Undesignated interest rate swaps Other noninterest income (101 )

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Heartland utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Securities available for sale, trading securities and derivatives are recorded in the consolidated balance sheets at fair value on a recurring basis. Additionally, from time to time, Heartland may be required to record at fair value other assets on a nonrecurring basis such as loans held for sale, loans held to maturity and certain other assets including, but not limited to, mortgage servicing rights, commercial servicing rights and other real estate owned. These nonrecurring fair value adjustments typically involve application of the lower of cost or fair value accounting or write-downs of individual assets. Fair Value Hierarchy Under ASC 820, assets and liabilities are grouped at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 — Valuation is based upon quoted prices for identical instruments in active markets. Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, or similar instruments in markets that are not active, and model-based valuation techniques for all significant assumptions are observable in the market. Level 3 — Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value on a recurring or non-recurring basis. Assets Securities Available for Sale and Held to Maturity Securities available for sale are recorded at fair value on a recurring basis. Securities held to maturity are generally recorded at cost and are recorded at fair value only to the extent a decline in fair value is determined to be other-than-temporary. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security's credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, as well as U.S. Treasury securities. Level 2 securities include U.S. government and agency securities, mortgage-backed securities and private collateralized mortgage obligations, municipal bonds and corporate debt securities. Level 3 securities consisted primarily of Z-TRANCHE mortgage-backed securities and corporate debt securities. On a quarterly basis, a secondary independent pricing service is used for the securities portfolio to validate the pricing from Heartland's primary pricing service. Loans Held for Sale Loans held for sale are carried at the lower of cost or fair value on an aggregate basis. The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, Heartland classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. Loans Held to Maturity Heartland does not record loans held to maturity at fair value on a recurring basis. However, from time to time, a loan is considered impaired and an allowance for loan losses is established. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC 310. The fair value of impaired loans is measured using one of the following impairment methods: 1) the present value of expected future cash flows discounted at the loan's effective interest rate or 2) the observable market price of the loan or 3) the fair value of the collateral if the loan is collateral dependent. In accordance with ASC 820, impaired loans measured at fair value are classified as nonrecurring Level 3 in the fair value hierarchy. Premises, Furniture and Equipment Held for Sale Heartland values premises, furniture and equipment held for sale based on third-party appraisals less estimated disposal costs. Heartland considers third party appraisals, as well as independent fair value assessments from Realtors or persons involved in selling bank premises, furniture and equipment, in determining the fair value of particular properties. Accordingly, the valuation of premises, furniture and equipment held for sale is subject to significant external and internal judgment. Heartland periodically reviews premises, furniture and equipment held for sale to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. Premises, furniture and equipment held for sale are classified as nonrecurring Level 3 in the fair value hierarchy. Mortgage Servicing Rights Mortgage servicing rights assets represent the value associated with servicing residential real estate loans that have been sold to outside investors with servicing retained. Heartland uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its mortgage servicing rights. The fair value for servicing assets is determined through discounted cash flow analysis and utilizes discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of the assumptions in the discounted cash flow analysis require a significant degree of management estimation and judgment. Mortgage servicing rights are subject to impairment testing. The carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. For purposes of measuring impairment, the rights are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a fair value less than the carrying value, mortgage servicing rights are adjusted to fair value through a valuation allowance. Heartland classifies mortgage servicing rights as nonrecurring with Level 3 measurement inputs. Commercial Servicing Rights Commercial servicing rights assets represent the value associated with servicing commercial loans guaranteed by the Small Business Administration and the United States Department of Agriculture that have been sold with servicing retained by Heartland. Heartland uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its commercial servicing rights. The fair value for servicing assets is determined through market prices for comparable servicing contracts, when available, or through a valuation model that calculates the present value of estimated future net servicing income. Inputs utilized include discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of these assumptions require a significant degree of management estimation and judgment. Commercial servicing rights are subject to impairment testing, and the carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. If the valuation model reflects a fair value less than the carrying value, commercial servicing rights are adjusted to fair value through a valuation allowance. Heartland classifies commercial servicing rights as nonrecurring with Level 3 measurement inputs. Derivative Financial Instruments Heartland's current interest rate risk strategy includes interest rate swaps. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. To comply with the provisions of ASC 820, Heartland incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, Heartland has considered the impact of netting any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although Heartland has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of September 30, 2017 , and December 31, 2016 , Heartland has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, Heartland has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. Interest rate lock commitments Heartland uses an internal valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management's assumptions and specific information about each borrower. Interest rate lock commitments are classified in Level 3 of the fair value hierarchy. Forward commitments The fair value of forward commitments are estimated using an internal valuation model, which includes current trade pricing for similar financial instruments in active markets that Heartland has the ability to access and are classified in Level 2 of the fair value hierarchy. Other Real Estate Owned Other real estate owned ("OREO") represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the fair value of the property at the time of acquisition (representing the property's cost basis), plus any acquisition costs, or the estimated fair value of the property, less disposal costs. Heartland considers third party appraisals, as well as independent fair value assessments from realtors or persons involved in selling OREO, in determining the fair value of particular properties. Accordingly, the valuation of OREO is subject to significant external and internal judgment. Heartland periodically reviews OREO to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. OREO is classified as nonrecurring Level 3 of the fair value hierarchy. The table below presents Heartland's assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2017 , and December 31, 2016 , in thousands, aggregated by the level in the fair value hierarchy within which those measurements fall: Total Fair Value Level 1 Level 2 Level 3 September 30, 2017 Assets Securities available for sale U.S. government corporations and agencies $ 7,415 $ 3,505 $ 3,910 $ — Mortgage-backed securities 1,565,400 — 1,565,400 — Obligations of states and political subdivisions 503,974 — 503,974 — Corporate debt securities — — — — Equity securities 16,596 — 16,596 — Derivative financial instruments (1) 3,386 — 3,386 — Interest rate lock commitments 2,463 — — 2,463 Forward commitments 237 — 237 — Total assets at fair value $ 2,099,471 $ 3,505 $ 2,093,503 $ 2,463 Liabilities Derivative financial instruments (2) $ 6,309 $ — $ 6,309 $ — Forward commitments 261 — 261 — Total liabilities at fair value $ 6,570 $ — $ 6,570 $ — December 31, 2016 Assets Securities available for sale U.S. government corporations and agencies $ 4,700 $ 517 $ 4,183 $ — Mortgage-backed securities 1,290,500 — 1,288,276 2,224 Obligations of states and political subdivisions 536,144 — 536,144 — Equity securities 14,520 — 14,520 — Derivative financial instruments (1) 3,222 — 3,222 — Interest rate lock commitments 2,790 — — 2,790 Forward commitments 2,546 — 2,546 — Total assets at fair value $ 1,854,422 $ 517 $ 1,848,891 $ 5,014 Liabilities Derivative financial instruments (2) $ 7,027 $ — $ 7,027 $ — Forward commitments 266 — 266 — Total liabilities at fair value $ 7,293 $ — $ 7,293 $ — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments The tables below present Heartland's assets that are measured at fair value on a nonrecurring basis, in thousands: Fair Value Measurements at September 30, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Year-to- Date (Gains) Losses Collateral dependent impaired loans: Commercial $ 3,556 $ — $ — $ 3,556 $ 1,119 Commercial real estate 8,718 — — 8,718 2,043 Agricultural and agricultural real estate 7,936 — — 7,936 — Residential real estate 1,365 — — 1,365 — Consumer 912 — — 912 — Total collateral dependent impaired loans $ 22,487 $ — $ — $ 22,487 $ 3,162 Other real estate owned $ 13,226 $ — $ — $ 13,226 $ 594 Premises, furniture and equipment held for sale $ 4,428 $ — $ — $ 4,428 $ 404 Commercial servicing rights $ 313 $ — $ — $ 313 $ (29 ) Fair Value Measurements at December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Year-to- Collateral dependent impaired loans: Commercial $ 1,683 $ — $ — $ 1,683 $ 41 Commercial real estate 3,026 — — 3,026 527 Agricultural and agricultural real estate 1,955 — — 1,955 — Residential real estate 3,565 — — 3,565 85 Consumer 1,193 — — 1,193 — Total collateral dependent impaired loans $ 11,422 $ — $ — — $ 11,422 $ 653 Other real estate owned $ 9,744 $ — $ — $ 9,744 $ 1,341 Premises, furniture and equipment held for sale $ 414 $ — $ — $ 414 $ 35 Commercial servicing rights $ 326 $ — $ — $ 326 $ 33 The following tables present additional quantitative information about assets measured at fair value and for which Heartland has utilized Level 3 inputs to determine fair value, in thousands: Fair Value at 9/30/17 Valuation Technique Unobservable Input Range (Weighted Average) Z-TRANCHE Securities $ — Discounted cash flows Pretax discount rate — Actual defaults — Actual deferrals — Interest rate lock commitments 2,463 Discounted cash flows Closing ratio 0-99% (89%) (1) Premises, furniture and equipment held for sale 4,428 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (4) Commercial servicing rights 313 Discounted cash flows Third party valuation (3) Other real estate owned 13,226 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% Collateral dependent impaired loans: Commercial 3,556 Modified appraised value Third party appraisal (2) Appraisal discount 0-15% (4) Commercial real estate 8,718 Modified appraised value Third party appraisal (2) Appraisal discount 0-14% (4) Agricultural and agricultural real estate 7,936 Modified appraised value Third party appraisal (2) Appraisal discount 0-6% (4) Residential real estate 1,365 Modified appraised value Third party appraisal (2) Appraisal discount 0-13% (4) Consumer 912 Modified appraised value Third party valuation (2) Valuation discount 0-11% (4) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (3) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. (4) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. Fair Value at 12/31/16 Valuation Technique Unobservable Input Range (Weighted Average) Z-TRANCHE Securities $ 2,224 Discounted cash flows Pretax discount rate 7.50 - 9.50% Actual defaults 21.77 - 37.62% (33.11%) Actual deferrals 10.44 - 26.29% (14.81%) Interest rate lock commitments 2,790 Discounted cash flows Closing ratio 0-99% (89%) (1) Premises, furniture and equipment held for sale 414 Modified appraised value Third party appraisal (2) 0-8% (4) Commercial servicing rights 326 Discounted cash flows Third party valuation (3) Other real estate owned 9,744 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% Collateral dependent impaired loans: Commercial 1,683 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (4) Commercial real estate 3,026 Modified appraised value Third party appraisal (2) Appraisal discount 0-7% (4) Agricultural and agricultural real estate 1,955 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (4) Residential real estate 3,565 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (4) Consumer 1,193 Modified appraised value Third party valuation (2) Valuation discount 0-11% (4) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (3) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. (4) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. The changes in fair value of the Z-TRANCHE securities, Level 3 assets that are measured on a recurring basis, are summarized in the following table, in thousands: For the Nine Months Ended For the Year Ended December 31, 2016 Balance at January 1, $ 2,224 $ 2,039 Total gains (losses): Included in earnings 2,810 — Included in other comprehensive income (2,166 ) 185 Purchases, sales and settlements: Purchases — — Sales (2,868 ) — Settlements — — Balance at period end $ — $ 2,224 The changes in fair value of the interest rate lock commitments, which are Level 3 financial instruments measured on a recurring basis, are summarized in the following table, in thousands: For the Nine Months Ended For the Year Ended December 31, 2016 Balance at January 1, $ 2,790 $ 3,168 Total gains (losses) included in earnings (587 ) (1,564 ) Issuances 1,580 5,373 Settlements (1,320 ) (4,187 ) Balance at period end $ 2,463 $ 2,790 Gains included in gains (losses) on sale of loans held for sale attributable to interest rate lock commitments held at September 30, 2017 , and December 31, 2016 , were $2.5 million and $2.8 million , respectively. The tables below summarize the estimated fair value of Heartland's financial instruments as defined by ASC 825 as of September 30, 2017 , and December 31, 2016 , in thousands. The carrying amounts in the following tables are recorded in the consolidated balance sheets under the indicated captions. In accordance with ASC 825, the assets and liabilities that are not financial instruments are not included in the disclosure, such as the value of the mortgage servicing rights, premises, furniture and equipment, premises, furniture and equipment held for sale, goodwill and other intangibles and other liabilities. Heartland does not believe that the estimated information presented herein is representative of the earnings power or value of Heartland. The following analysis, which is inherently limited in depicting fair value, also does not consider any value associated with either existing customer relationships or the ability of Heartland to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different. Fair Value Measurements at September 30, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 251,736 $ 251,736 $ 251,736 $ — $ — Time deposits in other financial institutions 19,793 19,793 19,793 — — Securities: Available for sale 2,093,385 2,093,385 3,505 2,089,880 — Held to maturity 256,355 270,386 — 270,386 — Other investments 23,176 23,176 — 22,981 195 Loans held for sale 35,795 35,795 — 35,795 — Loans, net: Commercial 1,596,934 1,601,351 — 1,597,795 3,556 Commercial real estate 3,143,414 3,117,829 — 3,109,111 8,718 Agricultural and agricultural real estate 506,388 507,974 — 500,038 7,936 Residential real estate 632,306 622,698 — 621,333 1,365 Consumer 441,079 444,384 — 443,472 912 Total Loans, net 6,320,121 6,294,236 — 6,271,749 22,487 Derivative financial instruments (1) 3,386 3,386 — 3,386 — Interest rate lock commitments 2,463 2,463 — — 2,463 Forward commitments 237 237 — 237 — Financial liabilities: Deposits Demand deposits 3,009,940 3,009,940 — 3,009,940 — Savings deposits 4,227,340 4,227,340 — 4,227,340 — Time deposits 994,604 994,604 — 994,604 — Short term borrowings 171,871 171,871 — 171,871 — Other borrowings 301,473 305,741 — 305,741 — Derivative financial instruments (2) 6,309 6,309 — 6,309 — Forward commitments 261 261 — 261 — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments Fair Value Measurements at December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 158,724 $ 158,724 $ 158,724 $ — $ — Time deposits in other financial institutions 2,105 2,105 2,105 — — Securities: Available for sale 1,845,864 1,845,864 517 1,843,123 2,224 Held to maturity 263,662 274,799 — 274,799 — Other investments 21,560 21,560 — 21,365 195 Loans held for sale 61,261 61,261 — 61,261 — Loans, net: Commercial 1,272,089 1,258,754 — 1,257,071 1,683 Commercial real estate 2,513,446 2,506,858 — 2,503,832 3,026 Agricultural and agricultural real estate 485,820 487,001 — 485,046 1,955 Residential real estate 614,207 604,233 — 600,668 3,565 Consumer 411,833 414,266 — 413,073 1,193 Total Loans, net 5,297,395 5,271,112 — 5,259,690 11,422 Derivative financial instruments (1) 3,222 3,222 — 3,222 — Interest rate lock commitments 2,790 2,790 — — 2,790 Forward commitments 2,546 2,546 — 2,546 — Financial liabilities: Deposits Demand deposits 2,202,036 2,202,036 — 2,202,036 — Savings deposits 3,788,089 3,788,089 — 3,788,089 — Time deposits 857,286 857,286 — 857,286 — Short term borrowings 306,459 306,459 — 306,459 — Other borrowings 288,534 288,534 — 288,534 — Derivative financial instruments (2) 7,027 7,027 — 7,027 — Forward commitments 266 266 — 266 — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments Cash and Cash Equivalents — The carrying amount is a reasonable estimate of fair value due to the short-term nature of these instruments. Time Deposits in Other Financial Institutions — The carrying amount is a reasonable estimate of fair value due to the short-term nature of these instruments. Securities — For securities either held to maturity, available for sale or trading, fair value equals quoted market price if available. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities. For Level 3 securities, Heartland utilizes independent pricing provided by third party vendors or brokers. Other Investments — Fair value measurement of other investments, which consists primarily of FHLB stock, are based on their redeemable value, which is at cost due to the restrictions placed on their transferability. The market for these securities is restricted to the issuer of the stock and subject to impairment evaluation. Loans — The fair value of loans is estimated using an entrance price concept by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. The fair value of impaired loans is measured using the fair value of the underlying collateral. The fair value of loans held for sale is estimated using quoted market prices. Interest Rate Lock Commitments — The fair value of interest rate lock commitments is estimated using an internal valuation model, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated closing ratio based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment group. Forward Commitments — The fair value of these instruments is estimated using an internal valuation model, which includes current trade pricing for similar financial instruments. Derivative Financial Instruments — The fair value of all derivatives is estimated based on the amount that Heartland would pay or would be paid to terminate the contract or agreement, using current rates and prices, and, when appropriate, the current creditworthiness of the counter-party. Deposits — The fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. If the fair value of the fixed maturity certificates of deposit is calculated at less than the carrying amount, the carrying value of these deposits is reported as the fair value. Short-term and Other Borrowings — Rates currently available to Heartland for debt with similar terms and remaining maturities are used to estimate fair value of existing debt. Commitments to Extend Credit, Unused Lines of Credit and Standby Letters of Credit — Based upon management's analysis of the off balance sheet financial instruments, there are no significant unrealized gains or losses associated with these financial instruments based upon review of the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING Heartland has identified two operating segments for purposes of financial reporting: community and other banking, and retail mortgage banking. These segments were determined based on the products and services provided or the type of customers served and are consistent with the information used by Heartland's key decision makers to make operating decisions and to assess Heartland's performance. The following tables present financial information for Heartland's operating segments for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Three Months Ended 2017 2016 Community and Other Banking Retail Mortgage Banking Total Community and Other Banking Retail Mortgage Banking Total Net interest income $ 88,778 $ 1,066 $ 89,844 $ 72,694 $ 987 $ 73,681 Provision for loan losses 5,705 — 5,705 5,328 — 5,328 Total noninterest income 19,680 5,297 24,977 17,337 11,205 28,542 Total noninterest expense 69,977 8,782 78,759 57,988 10,439 68,427 Income (loss) before taxes $ 32,776 $ (2,419 ) $ 30,357 $ 26,715 $ 1,753 $ 28,468 Average Loans, for the period $ 6,245,445 $ 40,839 $ 6,286,284 $ 5,464,304 $ 73,784 $ 5,538,088 Segment Assets, at period end $ 9,693,172 $ 62,455 $ 9,755,627 $ 8,084,810 $ 117,405 $ 8,202,215 Nine Months Ended 2017 2016 Community Retail Total Community Retail Total Net interest income $ 234,406 $ 3,046 $ 237,452 $ 216,172 $ 3,334 $ 219,506 Provision for loan losses 10,235 — 10,235 9,513 — 9,513 Total noninterest income 56,964 19,530 76,494 55,773 33,373 89,146 Total noninterest expense 193,753 26,044 219,797 177,421 32,335 209,756 Income (loss) before taxes $ 87,382 $ (3,468 ) $ 83,914 $ 85,011 $ 4,372 $ 89,383 Average Loans, for the period $ 5,641,641 $ 37,979 $ 5,679,620 $ 5,422,843 $ 70,344 $ 5,493,187 Segment Assets, at period end $ 9,693,172 $ 62,455 $ 9,755,627 $ 8,084,810 $ 117,405 $ 8,202,215

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2016 , included in the Form 10-K of Heartland Financial USA, Inc. ("Heartland") filed with the Securities and Exchange Commission ("SEC") on March 1, 2017 . Foot note disclosures to the interim unaudited consolidated financial statements which would substantially duplicate the disclosure contained in the footnotes to the audited consolidated financial statements have been omitted. The financial information of Heartland included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments), that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. The results of the interim period ended September 30, 2017 , are not necessarily indicative of the results expected for the year ending December 31, 2017 .
Earnings Per Share	Basic earnings per share is determined using net income available to common stockholders and weighted average common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average common shares and assumed incremental common shares issued.
Stock-Based Compensation	Heartland may grant, through its Nominating and Compensation Committee (the "Compensation Committee"), non-qualified and incentive stock options, stock appreciation rights, stock awards, restricted stock, restricted stock units and cash incentive awards, under its 2012 Long-Term Incentive Plan (the "Plan"). The Plan was originally approved by stockholders in May 2012 and was amended effective March 8, 2016, to increase the number of shares of common stock authorized for issuance and make certain other changes to the Plan. As of September 30, 2017 , 499,656 shares of common stock were available for issuance under future awards that may be granted under the Plan to employees and directors of, and service providers to, Heartland or its subsidiaries. Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 718, "Compensation-Stock Compensation" requires the measurement of the cost of employee services received in exchange for an award of equity instruments based upon the fair value of the award on the grant date. The cost of the award is based upon its fair value estimated on the date of grant and recognized in the consolidated statements of income over the vesting period of the award. The fair market value of restricted stock and restricted stock units is based on the fair value of the underlying shares of common stock on the date of grant. The fair value of stock options is estimated on the date of grant using the Black-Scholes model. Forfeitures are accounted for as they occur. The amount of tax benefit related to the exercise, vesting and forfeiture of equity-based awards reflected as a tax benefit in Heartland's income tax expense was $1.1 million during the nine months ended September 30, 2017 . Prior to the adoption of ASU 2016-09 on January 1, 2017, $1.1 million of tax benefit related to the exercise, vesting and forfeiture of equity based awards was reflected in additional paid-in-capital during the nine months ended September 30, 2016. Restricted Stock Units The Plan permits the Compensation Committee to grant restricted stock units ("RSUs"). In the first quarter of 2017, the Compensation Committee granted time-based RSUs with respect to 55,665 shares of common stock, and in the first quarter of 2016, the Compensation Committee granted time-based RSUs with respect to 72,644 shares of common stock to selected officers and employees. The time-based RSUs represent the right, without payment, to receive shares of Heartland common stock on a specified future date in three equal installments starting in the year following the initial grant. The time-based RSUs will be settled in common stock upon vesting, and will not be entitled to dividends until vested. The time-based RSUs may also vest upon death or disability, upon a change in control or upon a "qualified retirement" (as defined in the RSU agreement). The retiree is required to sign a non-solicitation agreement as a condition to vesting. In addition to the time-based RSUs referenced in the preceding paragraph, the Compensation Committee granted performance-based RSUs with respect to 27,570 shares of common stock in the first quarter of 2017, and 35,516 shares of common stock in the first quarter of 2016. These performance-based RSUs are earned based on satisfaction of performance targets for the fiscal years ended December 31, 2017, and December 31, 2016, respectively, and then fully vest on a specified date in the third calendar year following the year of the initial grant. The performance-based RSUs vest to the extent that they are earned upon death or disability, upon a change in control or upon a "qualified retirement." The Compensation Committee also granted three -year performance-based RSUs with respect to 9,032 shares of common stock in the first quarter of 2017, and 11,408 shares of common stock in the first quarter of 2016. These performance-based RSUs will be earned based on satisfaction of performance targets for the three -year performance period ended December 31, 2019, and December 31, 2018, respectively. These performance-based RSUs or a portion thereof may vest in 2020 and 2019, respectively, after measurement of performance in relation to the performance targets. Upon death, disability, or a "qualified retirement," all performance-based RSUs granted in 2016 remain outstanding and are earned based on actual performance at the end of each performance period. All RSUs granted on or after March 8, 2016, become fully vested upon a change in control if (1) they are not assumed by the successor corporation or (2) upon an involuntary termination of the participant's employment within two years after the change in control. The Compensation Committee may grant RSUs under the Plan to directors as part of their compensation, to new management level employees at commencement of employment, and to other employees and service providers as incentives.
Subsequent Events	Heartland has evaluated subsequent events that may require recognition or disclosure through the filing date of this Quarterly Report on Form 10-Q with the SEC.
Effect of New Financial Accounting Standards	In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." The amendment clarifies the principles for recognizing revenue and develops a common revenue standard. The amendment outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” In applying the revenue model to contracts within its scope, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The new guidance does not apply to certain contracts within the scope of other ASC Topics, such as lease contracts, insurance contracts, financing arrangements, financial instruments, guarantees other than product or service warranties and nonmonetary exchanges between entities in the same line of business to facilitate sales to customers. Heartland continues to evaluate noninterest income contracts affected by the new guidance by analyzing contracts and current accounting practices to determine if a change is appropriate. The amendment is largely consistent with existing guidance and current practices. Heartland intends to adopt the accounting standard in 2018, as required, which may require a change in the recognition of certain recurring revenue streams within trust and investment management fees; however, Heartland's preliminary analysis suggests the adoption of these amendments are not expected to have a significant effect on Heartland's results of operations, financial position and liquidity other than expanded disclosure requirements. In January 2016, the FASB issued ASU 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities." The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, make the following changes: (1) require equity investments to be measured at fair value with changes in fair value recognized in net income; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (3) eliminate the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (4) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (5) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (6) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; (7) clarify that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item (5) above, early adoption of the amendments in this update is not permitted. Heartland intends to adopt the accounting standard in 2018, as required, and is currently evaluating the potential impact of this guidance on its results of operations, financial position and liquidity. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." Topic 842 requires a lessee to recognize leases on its balance sheet and disclose key information about leasing arrangements. The new standard establishes a right-of-use model (ROU) that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as financing or operating, with such classification affecting the categorization of expense recognition in the income statement. The amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and will be applied on a modified retrospective basis. Heartland leases certain properties and equipment under operating leases that will result in recognition of lease assets and lease liabilities on the consolidated balance sheets under this ASU; however the majority of Heartland's properties and equipment are owned and not leased. Heartland intends to adopt the accounting standard in 2019 as required. In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718)." The amendments in this ASU simplify several aspects of the accounting for share-based payments, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The amendments in this ASU are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption was permitted for any interim or annual period prior to the effective date. Heartland adopted this ASU on January 1, 2017, as required, using a prospective transition method. The requirement to report the excess tax benefit or shortfall related to settlements of share-based payment awards in earnings as an increase or decrease to tax expense has been applied to settlements occurring on or after January 1, 2017, and the impact of applying the guidance reduced reported income tax expense by $1.1 million . ASU 2016-09 also requires that all income tax related cash flows resulting from share-based payments be reported as an operating activity in the consolidated statements of cash flows. Previously income tax benefits resulting from the settlement of a share-based award were reported as a reduction of operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the period in which the share-based awards vested. Heartland elected to adopt the change in cash flow classification on a retrospective basis, which resulted in a $1.1 million increase to net cash from operating activities and a corresponding decrease to net cash from financing activities in the accompanying consolidated statement of cash flows for the nine months ended September 30, 2016. Heartland has elected to account for forfeitures as they occur. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326)." The amendments in this ASU require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The amendments in this ASU indicate that an entity should not use the length of time a security has been in an unrealized loss position to avoid recording a credit loss. In addition, in determining whether a credit loss exists, the amendments in this ASU also remove the requirements to consider the historical and implied volatility of the fair value of a security and recoveries or declines in fair value after the balance sheet date. The amendments are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Heartland intends to adopt the accounting standard in 2020, as required. Heartland has formed a committee to review the standard, understand the potential impact of this guidance on its results of operations, financial position and liquidity, and oversee the implementation of the standard. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments." The amendments in this update address eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity adopts the amendments early in an interim period, any adjustments must be reflected as of the beginning of the fiscal year that includes the interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The amendments in this update must be applied using a retrospective transition method to each period presented. Heartland intends to adopt this ASU in 2018, as required, and is currently evaluating the potential impact on its results of operations, financial position, and liquidity. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740) - Intra-Entity Transfer of Assets Other Than Inventory." The amendment requires an entity to recognize income tax consequences on an intra-entity transfer of an asset other than inventory at the time the transaction occurs. The amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The amendments must be applied using a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Heartland intends to adopt this ASU in 2018, as required, and the adoption of this amendment is not expected to have a significant effect on Heartland's results of operations, financial position and liquidity. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350)." This amendment is to simplify the subsequent measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing the impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized cannot exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied prospectively. Early adoption is permitted, including in an interim period for impairment tests performed after January 1, 2017. Heartland intends to adopt this ASU in the third quarter of 2020, consistent with the annual impairment test as of September 30, 2020, and is currently evaluating the potential impact of this guidance on its results of operations, financial position and liquidity. In March 2017, the FASB issued ASU 2017-08, "Receivables - Nonrefundable Fee and Other Costs (Subtopic 310-20)." These amendments shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount. Discounts continue to be amortized to maturity. These amendments are effective for public business entities for fiscal years and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If any entity early adopts the amendments in an interim period, any adjustments must be reflected as of the beginning of the fiscal year that includes the interim period. The amendments must be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Heartland intends to adopt this ASU in 2019, as required, and is currently evaluating the potential impact on its results of operations, financial position, and liquidity. In May 2017, the FASB issued ASU 2017-09, " Compensation - Stock Compensation (Topic 718) ." The amendments provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. An entity should account for the effects of a modification unless all the following are met; (1) the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification; (2) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; (3) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments are effective for annual periods and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim periods for public business entities for reporting periods for which financial statements have not yet been issued. The amendments should be applied prospectively to an award modified on or after the adoption date. Heartland intends to adopt this ASU in 2018, as required, and does not believe there will be a material impact to its results of operations, financial position, and liquidity because Heartland has not typically modified share-based payment awards after the original award has been granted. In August 2017, the FASB issued ASU 2017-12, " Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ." The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which Heartland will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. Heartland currently intends to adopt this ASU in 2019, as required, and does not believe there will be a material impact to its results of operations, financial position, and liquidity.
Fair Value Hierarchy	Under ASC 820, assets and liabilities are grouped at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 — Valuation is based upon quoted prices for identical instruments in active markets. Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, or similar instruments in markets that are not active, and model-based valuation techniques for all significant assumptions are observable in the market. Level 3 — Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value on a recurring or non-recurring basis. Assets Securities Available for Sale and Held to Maturity Securities available for sale are recorded at fair value on a recurring basis. Securities held to maturity are generally recorded at cost and are recorded at fair value only to the extent a decline in fair value is determined to be other-than-temporary. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security's credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, as well as U.S. Treasury securities. Level 2 securities include U.S. government and agency securities, mortgage-backed securities and private collateralized mortgage obligations, municipal bonds and corporate debt securities. Level 3 securities consisted primarily of Z-TRANCHE mortgage-backed securities and corporate debt securities. On a quarterly basis, a secondary independent pricing service is used for the securities portfolio to validate the pricing from Heartland's primary pricing service. Loans Held for Sale Loans held for sale are carried at the lower of cost or fair value on an aggregate basis. The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, Heartland classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. Loans Held to Maturity Heartland does not record loans held to maturity at fair value on a recurring basis. However, from time to time, a loan is considered impaired and an allowance for loan losses is established. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC 310. The fair value of impaired loans is measured using one of the following impairment methods: 1) the present value of expected future cash flows discounted at the loan's effective interest rate or 2) the observable market price of the loan or 3) the fair value of the collateral if the loan is collateral dependent. In accordance with ASC 820, impaired loans measured at fair value are classified as nonrecurring Level 3 in the fair value hierarchy. Premises, Furniture and Equipment Held for Sale Heartland values premises, furniture and equipment held for sale based on third-party appraisals less estimated disposal costs. Heartland considers third party appraisals, as well as independent fair value assessments from Realtors or persons involved in selling bank premises, furniture and equipment, in determining the fair value of particular properties. Accordingly, the valuation of premises, furniture and equipment held for sale is subject to significant external and internal judgment. Heartland periodically reviews premises, furniture and equipment held for sale to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. Premises, furniture and equipment held for sale are classified as nonrecurring Level 3 in the fair value hierarchy. Mortgage Servicing Rights Mortgage servicing rights assets represent the value associated with servicing residential real estate loans that have been sold to outside investors with servicing retained. Heartland uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its mortgage servicing rights. The fair value for servicing assets is determined through discounted cash flow analysis and utilizes discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of the assumptions in the discounted cash flow analysis require a significant degree of management estimation and judgment. Mortgage servicing rights are subject to impairment testing. The carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. For purposes of measuring impairment, the rights are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a fair value less than the carrying value, mortgage servicing rights are adjusted to fair value through a valuation allowance. Heartland classifies mortgage servicing rights as nonrecurring with Level 3 measurement inputs. Commercial Servicing Rights Commercial servicing rights assets represent the value associated with servicing commercial loans guaranteed by the Small Business Administration and the United States Department of Agriculture that have been sold with servicing retained by Heartland. Heartland uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its commercial servicing rights. The fair value for servicing assets is determined through market prices for comparable servicing contracts, when available, or through a valuation model that calculates the present value of estimated future net servicing income. Inputs utilized include discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of these assumptions require a significant degree of management estimation and judgment. Commercial servicing rights are subject to impairment testing, and the carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. If the valuation model reflects a fair value less than the carrying value, commercial servicing rights are adjusted to fair value through a valuation allowance. Heartland classifies commercial servicing rights as nonrecurring with Level 3 measurement inputs. Derivative Financial Instruments Heartland's current interest rate risk strategy includes interest rate swaps. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. To comply with the provisions of ASC 820, Heartland incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, Heartland has considered the impact of netting any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although Heartland has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of September 30, 2017 , and December 31, 2016 , Heartland has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, Heartland has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. Interest rate lock commitments Heartland uses an internal valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management's assumptions and specific information about each borrower. Interest rate lock commitments are classified in Level 3 of the fair value hierarchy. Forward commitments The fair value of forward commitments are estimated using an internal valuation model, which includes current trade pricing for similar financial instruments in active markets that Heartland has the ability to access and are classified in Level 2 of the fair value hierarchy. Other Real Estate Owned Other real estate owned ("OREO") represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the fair value of the property at the time of acquisition (representing the property's cost basis), plus any acquisition costs, or the estimated fair value of the property, less disposal costs. Heartland considers third party appraisals, as well as independent fair value assessments from realtors or persons involved in selling OREO, in determining the fair value of particular properties. Accordingly, the valuation of OREO is subject to significant external and internal judgment. Heartland periodically reviews OREO to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. OREO is classified as nonrecurring Level 3 of the fair value hierarchy.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Amounts used in the determination of basic and diluted earnings per share for the three- and nine- month periods ended September 30, 2017 and 2016 , are shown in the table below: Three Months Ended (Dollars and number of shares in thousands, except per share data) 2017 2016 Net income $ 21,632 $ 20,208 Preferred dividends and discount (13 ) (53 ) Interest expense on convertible preferred debt 3 17 Net income available to common stockholders $ 21,622 $ 20,172 Weighted average common shares outstanding for basic earnings per share 29,648 24,601 Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units 262 322 Weighted average common shares for diluted earnings per share 29,910 24,923 Earnings per common share — basic $ 0.73 $ 0.82 Earnings per common share — diluted $ 0.72 $ 0.81 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation — — Nine Months Ended (Dollars and number of shares in thousands, except per share data) 2017 2016 Net income $ 61,600 $ 61,187 Preferred dividends (45 ) (273 ) Interest expense on convertible preferred debt 12 48 Net income available to common stockholders $ 61,567 $ 60,962 Weighted average common shares outstanding for basic earnings per share 27,569 24,262 Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units 265 319 Weighted average common shares for diluted earnings per share 27,834 24,581 Earnings per common share — basic $ 2.23 $ 2.51 Earnings per common share — diluted $ 2.21 $ 2.48 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation — —
Summary of Status of RSUs	A summary of the RSUs outstanding as of September 30, 2017 and 2016 , and changes during the nine months ended September 30, 2017 and 2016 , follows: 2017 2016 Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding at January 1 346,817 $ 27.61 353,195 $ 25.53 Granted 109,071 47.21 143,721 29.75 Vested (136,428 ) 26.66 (117,898 ) 23.44 Forfeited (12,923 ) 31.57 (11,547 ) 27.12 Outstanding at September 30 306,537 $ 34.72 367,471 $ 27.60
Summary of Status of Stock Options	A summary of the stock options outstanding as of September 30, 2017 and 2016 , and changes during the nine months ended September 30, 2017 and 2016 , follows: 2017 2016 Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Outstanding at January 1 26,400 $ 18.60 125,950 $ 24.08 Granted — — — — Exercised (13,650 ) 18.60 (55,250 ) 24.82 Forfeited (500 ) 18.60 (1,500 ) 21.10 Outstanding at September 30 12,250 $ 18.60 69,200 $ 23.55 Options exercisable at September 30 12,250 $ 18.60 69,200 $ 23.55

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions Fair Values	The following table represents, in thousands, the amounts recorded on the consolidated balance sheet as of July 7, 2017: As of July 7, 2017 Fair value of consideration paid: Common stock (3,216,161 shares) $ 152,607 Cash 58,636 Total consideration paid 211,243 Fair value of assets acquired: Cash and due from banks 21,341 Interest bearing deposits in other financial institutions 74,686 Time deposits in other financial institutions 6,304 Securities: Securities available for sale 234,390 Other securities 2,628 Loans held to maturity 985,399 Premises, furniture and equipment, net 17,206 Premises, furniture and equipment held for sale 1,350 Other real estate, net 6,916 Other intangible assets, net 16,041 Other assets 32,278 Total assets 1,398,539 Fair value of liabilities assumed: Deposits 1,210,074 Short term borrowings 34,445 Other borrowings 21,636 Other liabilities 16,295 Total liabilities assumed 1,282,450 Fair value of net assets acquired 116,089 Goodwill resulting from acquisition $ 95,154
Pro Forma	The following pro forma information represents the results of operations for the nine-month periods ended September 30, 2017, and 2016, as if the Citywide Banks of Colorado, Inc. acquisition occurred on January 1, 2017, and January 1, 2016, respectively: (Dollars in thousands, except per share data), unaudited For the Nine Months Ended September 30, 2017 September 30, 2016 Net interest income $ 264,485 $ 256,579 Net income available to common stockholders $ 61,940 $ 68,857 Basic earnings per share $ 2.08 $ 2.51 Diluted earnings per share $ 2.06 $ 2.48

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of Available for Sale Securities	The amortized cost, gross unrealized gains and losses, and estimated fair values of securities available for sale as of September 30, 2017 , and December 31, 2016 , are summarized in the table below, in thousands: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2017 U.S. government corporations and agencies $ 7,435 $ 14 $ (34 ) $ 7,415 Mortgage-backed securities 1,593,677 4,656 (32,933 ) 1,565,400 Obligations of states and political subdivisions 506,867 4,307 (7,200 ) 503,974 Total debt securities 2,107,979 8,977 (40,167 ) 2,076,789 Equity securities 16,253 343 — 16,596 Total $ 2,124,232 $ 9,320 $ (40,167 ) $ 2,093,385 December 31, 2016 U.S. government corporations and agencies $ 4,716 $ 16 $ (32 ) $ 4,700 Mortgage-backed securities 1,321,760 7,026 (38,286 ) 1,290,500 Obligations of states and political subdivisions 553,020 2,436 (19,312 ) 536,144 Total debt securities 1,879,496 9,478 (57,630 ) 1,831,344 Equity securities 14,451 69 — 14,520 Total $ 1,893,947 $ 9,547 $ (57,630 ) $ 1,845,864
Schedule of Held to Maturity Securities	The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of September 30, 2017 , and December 31, 2016 , are summarized in the table below, in thousands: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2017 Obligations of states and political subdivisions $ 256,355 $ 14,722 $ (691 ) $ 270,386 Total $ 256,355 $ 14,722 $ (691 ) $ 270,386 December 31, 2016 Obligations of states and political subdivisions $ 263,662 $ 12,282 $ (1,145 ) $ 274,799 Total $ 263,662 $ 12,282 $ (1,145 ) $ 274,799
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities available for sale at September 30, 2017 , by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. September 30, 2017 Amortized Cost Estimated Fair Value Due in 1 year or less $ 185 $ 186 Due in 1 to 5 years 40,716 41,077 Due in 5 to 10 years 93,240 91,514 Due after 10 years 380,161 378,612 Total debt securities 514,302 511,389 Mortgage-backed securities 1,593,677 1,565,400 Equity securities 16,253 16,596 Total investment securities $ 2,124,232 $ 2,093,385 The amortized cost and estimated fair value of debt securities held to maturity at September 30, 2017 , by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. September 30, 2017 Amortized Cost Estimated Fair Value Due in 1 year or less $ 1,510 $ 1,533 Due in 1 to 5 years 21,157 22,090 Due in 5 to 10 years 105,030 109,119 Due after 10 years 128,658 137,644 Total investment securities $ 256,355 $ 270,386
Schedule of Realized Gross Gains (Losses)	Gross gains and losses realized related to the sales of securities available for sale for the three- and nine- month periods ended September 30, 2017 and 2016 , are summarized as follows, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Proceeds from sales $ 503,083 $ 146,242 $ 1,127,091 $ 768,617 Gross security gains 2,088 1,763 8,585 11,416 Gross security losses 409 177 3,023 1,332
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following tables summarize, in thousands, the amount of unrealized losses, defined as the amount by which cost or amortized cost exceeds fair value, and the related fair value of investments with unrealized losses in Heartland's securities portfolio as of September 30, 2017 , and December 31, 2016 . The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or more. The reference point for determining how long an investment was in an unrealized loss position w as September 30, 2016 , and December 31, 2015 , respectively. Securities for which Heartland has taken credit-related other-than-temporary impairment ("OTTI") write-downs are categorized as being "less than 12 months" or "12 months or longer" in a continuous loss position based on the point in time that the fair value declined to below the cost basis and not the period of time since the credit-related OTTI write-down. Securities available for sale Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 U.S. government corporations and agencies $ 6,901 $ (34 ) $ — $ — $ 6,901 $ (34 ) Mortgage-backed securities 761,235 (11,558 ) 431,669 (21,375 ) 1,192,904 (32,933 ) Obligations of states and political subdivisions 149,931 (1,820 ) 153,068 (5,380 ) 302,999 (7,200 ) Total debt securities 918,067 (13,412 ) 584,737 (26,755 ) 1,502,804 (40,167 ) Equity securities — — — — — — Total temporarily impaired securities $ 918,067 $ (13,412 ) $ 584,737 $ (26,755 ) $ 1,502,804 $ (40,167 ) December 31, 2016 U.S. government corporations and agencies $ 4,185 $ (32 ) $ — $ — $ 4,185 $ (32 ) Mortgage-backed securities 744,202 (23,527 ) 272,449 (14,759 ) 1,016,651 (38,286 ) Obligations of states and political subdivisions 414,151 (19,309 ) 251 (3 ) 414,402 (19,312 ) Total debt securities 1,162,538 (42,868 ) 272,700 (14,762 ) 1,435,238 (57,630 ) Equity securities — — — — — — Total temporarily impaired securities $ 1,162,538 $ (42,868 ) $ 272,700 $ (14,762 ) $ 1,435,238 $ (57,630 )
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	Securities held to maturity Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 Obligations of states and political subdivisions $ 6,278 $ (43 ) $ 8,894 $ (648 ) $ 15,172 $ (691 ) Total temporarily impaired securities $ 6,278 $ (43 ) $ 8,894 $ (648 ) $ 15,172 $ (691 ) December 31, 2016 Obligations of states and political subdivisions $ 31,479 $ (884 ) $ 2,017 $ (261 ) $ 33,496 $ (1,145 ) Total temporarily impaired securities $ 31,479 $ (884 ) $ 2,017 $ (261 ) $ 33,496 $ (1,145 )
OTTI Write-downs Included in Earnings and AOCI	The following table shows the detail of OTTI write-downs on debt securities included in earnings and the related changes in other accumulated comprehensive income ("AOCI") for the same securities, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Recorded as part of gross realized losses: Credit related OTTI $ — $ — $ — $ — Intent to sell OTTI — — — — Total recorded as part of gross realized losses — — — — Recorded directly to AOCI for non-credit related impairment: Residential mortgage backed securities — — — — Reduction of non-credit related impairment related to security sales — — — (120 ) Accretion of non-credit related impairment — — — (7 ) Total changes to AOCI for non-credit related impairment — — — (127 ) Total OTTI losses (accretion) recorded on debt securities, net $ — $ — $ — $ (127 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of Loans and Leases	Loans as of September 30, 2017 , and December 31, 2016 , were as follows, in thousands: September 30, 2017 December 31, 2016 Loans receivable held to maturity: Commercial $ 1,613,903 $ 1,287,265 Commercial real estate 3,163,953 2,538,582 Agricultural and agricultural real estate 511,764 489,318 Residential real estate 635,611 617,924 Consumer 450,088 420,613 Gross loans receivable held to maturity 6,375,319 5,353,702 Unearned discount (605 ) (699 ) Deferred loan fees (1,299 ) (1,284 ) Total net loans receivable held to maturity 6,373,415 5,351,719 Allowance for loan losses (54,885 ) (54,324 ) Loans receivable, net $ 6,318,530 $ 5,297,395
Allowance for Loan and Lease Losses, Based on Impairment Methodology	The following table shows the balance in the allowance for loan losses at September 30, 2017 , and December 31, 2016 , and the related loan balances, disaggregated on the basis of impairment methodology, in thousands. Loans evaluated under ASC 310-10-35 include loans on nonaccrual status and troubled debt restructurings, which are individually evaluated for impairment, and other impaired loans deemed to have similar risk characteristics. All other loans are collectively evaluated for impairment under ASC 450-20. Heartland has made no significant changes to the accounting for the allowance for loan losses during 2017. Allowance For Loan Losses Gross Loans Receivable Held to Maturity Ending Balance Under ASC 310-10-35 Ending Balance Under ASC 450-20 Total Ending Balance Evaluated for Impairment Under ASC 310-10-35 Ending Balance Evaluated for Impairment Under ASC 450-20 Total September 30, 2017 Commercial $ 2,166 $ 14,804 $ 16,970 $ 6,957 $ 1,606,946 $ 1,613,903 Commercial real estate 864 19,676 20,540 27,943 3,136,010 3,163,953 Agricultural and agricultural real estate 2,353 3,774 6,127 12,792 498,972 511,764 Residential real estate 393 1,873 2,266 29,833 605,778 635,611 Consumer 1,267 7,715 8,982 6,524 443,564 450,088 Total $ 7,043 $ 47,842 $ 54,885 $ 84,049 $ 6,291,270 $ 6,375,319 December 31, 2016 Commercial $ 1,318 $ 13,447 $ 14,765 $ 3,712 $ 1,283,553 $ 1,287,265 Commercial real estate 2,671 21,648 24,319 45,217 2,493,365 2,538,582 Agricultural and agricultural real estate 816 3,394 4,210 16,730 472,588 489,318 Residential real estate 497 1,766 2,263 25,726 592,198 617,924 Consumer 1,451 7,316 8,767 5,988 414,625 420,613 Total $ 6,753 $ 47,571 $ 54,324 $ 97,373 $ 5,256,329 $ 5,353,702
Schedule of Financing Receivables, Non Accrual Status	The following table presents nonaccrual loans, accruing loans past due 90 days or more and troubled debt restructured loans at September 30, 2017 , and December 31, 2016 , in thousands: September 30, 2017 December 31, 2016 Nonaccrual loans $ 59,451 $ 62,591 Nonaccrual troubled debt restructured loans 4,005 1,708 Total nonaccrual loans $ 63,456 $ 64,299 Accruing loans past due 90 days or more $ 2,348 $ 86 Performing troubled debt restructured loans $ 10,040 $ 10,380
Troubled Debt Restructuring on Loans Modified	The following tables provide information on troubled debt restructured loans that were modified during the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , dollars in thousands: Three Months Ended 2017 2016 Number Pre- Post- Number Pre- Post- Commercial — $ — $ — — $ — $ — Commercial real estate — — — — — — Total commercial and commercial real estate — — — — — — Agricultural and agricultural real estate — — — — — — Residential real estate 8 1,174 1,174 5 651 651 Consumer — — — — — — Total 8 $ 1,174 $ 1,174 5 $ 651 $ 651 Nine Months Ended 2017 2016 Number of Loans Pre- Modification Recorded Investment Post- Modification Recorded Investment Number of Loans Pre- Modification Recorded Investment Post- Modification Recorded Investment Commercial 3 $ 131 $ 131 1 $ 100 $ 100 Commercial real estate — — — 1 179 179 Total commercial and commercial real estate 3 131 131 2 279 279 Agricultural and agricultural real estate — — — — — — Residential real estate 22 2,977 2,977 5 651 651 Consumer — — — — — — Total 25 $ 3,108 $ 3,108 7 $ 930 $ 930 The following table shows troubled debt restructured loans for which there was a payment default during the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , that had been modified during the twelve-month period prior to default, in thousands: With Payment Defaults During the Following Periods Three Months Ended 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial — $ — — $ — Commercial real estate — — — — Total commercial and commercial real estate — — — — Agricultural and agricultural real estate — — — — Residential real estate 5 1,221 — — Consumer — — — — Total 5 $ 1,221 — $ — With Payment Defaults During the Following Periods Nine Months Ended 2017 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial — $ — 1 $ 95 Commercial real estate — — — — Total commercial and commercial real estate — — 1 95 Agricultural and agricultural real estate — — — — Residential real estate 8 1,480 — — Consumer — — — — Total 8 $ 1,480 1 $ 95
Financing Receivable Credit Quality Indicators	The following table presents loans by credit quality indicator at September 30, 2017 , and December 31, 2016 , in thousands: Pass Nonpass Total September 30, 2017 Commercial $ 1,523,080 $ 90,823 $ 1,613,903 Commercial real estate 2,992,663 171,290 3,163,953 Total commercial and commercial real estate 4,515,743 262,113 4,777,856 Agricultural and agricultural real estate 445,554 66,210 511,764 Residential real estate 597,987 37,624 635,611 Consumer 437,831 12,257 450,088 Total gross loans receivable held to maturity $ 5,997,115 $ 378,204 $ 6,375,319 December 31, 2016 Commercial $ 1,187,557 $ 99,708 $ 1,287,265 Commercial real estate 2,379,632 158,950 2,538,582 Total commercial and commercial real estate 3,567,189 258,658 3,825,847 Agricultural and agricultural real estate 424,311 65,007 489,318 Residential real estate 584,626 33,298 617,924 Consumer 409,474 11,139 420,613 Total gross loans receivable held to maturity $ 4,985,600 $ 368,102 $ 5,353,702
Past Due Financing Receivables	The following table sets forth information regarding Heartland's accruing and nonaccrual loans at September 30, 2017 , and December 31, 2016 , in thousands: Accruing Loans 30-59 Days Past Due 60-89 Days 90 Days or More Past Due Total Past Due Current Nonaccrual Total Loans September 30, 2017 Commercial $ 2,591 $ 133 $ 215 $ 2,939 $ 1,603,397 $ 7,567 $ 1,613,903 Commercial real estate 6,140 465 — 6,605 3,140,672 16,676 3,163,953 Total commercial and commercial real estate 8,731 598 215 9,544 4,744,069 24,243 4,777,856 Agricultural and agricultural real estate 315 782 1,282 2,379 496,593 12,792 511,764 Residential real estate 5,033 449 — 5,482 607,165 22,964 635,611 Consumer 3,001 1,813 851 5,665 440,966 3,457 450,088 Total gross loans receivable held to maturity $ 17,080 $ 3,642 $ 2,348 $ 23,070 $ 6,288,793 $ 63,456 $ 6,375,319 December 31, 2016 Commercial $ 1,127 $ 219 $ 77 $ 1,423 $ 1,281,241 $ 4,601 $ 1,287,265 Commercial real estate 886 3,929 — 4,815 2,513,069 20,698 2,538,582 Total commercial and commercial real estate 2,013 4,148 77 6,238 3,794,310 25,299 3,825,847 Agricultural and agricultural real estate 199 3,191 — 3,390 472,597 13,331 489,318 Residential real estate 4,986 846 — 5,832 590,626 21,466 617,924 Consumer 3,455 1,021 9 4,485 411,925 4,203 420,613 Total gross loans receivable held to maturity $ 10,653 $ 9,206 $ 86 $ 19,945 $ 5,269,458 $ 64,299 $ 5,353,702
Summary of Impaired Loans	The following tables present, by category of loan, impaired loans, the unpaid contractual loan balances at September 30, 2017 , and December 31, 2016 ; the outstanding loan balances recorded on the consolidated balance sheets at September 30, 2017 , and December 31, 2016 ; any related allowance recorded for those loans as of September 30, 2017 , and December 31, 2016 ; the average outstanding loan balances recorded on the consolidated balance sheets during the three- and nine- months ended September 30, 2017 , and year ended December 31, 2016 ; and the interest income recognized on the impaired loans during the three- and nine- month periods ended September 30, 2017 , and year ended December 31, 2016 , in thousands: Unpaid Contractual Balance Loan Balance Related Allowance Recorded Quarter- to- Date Avg. Loan Balance Quarter- to- Date Interest Income Recognized Year- to- Date Avg. Loan Balance Year- to- Date Interest Income Recognized September 30, 2017 Impaired loans with a related allowance: Commercial $ 3,190 $ 3,190 $ 2,166 $ 4,885 $ — $ 3,829 $ 1 Commercial real estate 11,272 9,416 864 10,637 — 12,106 7 Total commercial and commercial real estate 14,462 12,606 3,030 15,522 — 15,935 8 Agricultural and agricultural real estate 10,289 10,289 2,353 3,532 — 2,140 — Residential real estate 1,640 1,640 393 1,633 — 2,197 10 Consumer 2,179 2,179 1,267 2,155 10 2,343 32 Total impaired loans with a related allowance $ 28,570 $ 26,714 $ 7,043 $ 22,842 $ 10 $ 22,615 $ 50 Impaired loans without a related allowance: Commercial $ 4,887 $ 3,767 $ — $ 2,727 $ — $ 2,017 $ 112 Commercial real estate 19,132 18,527 — 18,237 201 21,750 536 Total commercial and commercial real estate 24,019 22,294 — 20,964 201 23,767 648 Agricultural and agricultural real estate 2,503 2,503 — 8,343 — 10,858 — Residential real estate 28,197 28,193 — 27,556 112 26,006 230 Consumer 4,345 4,345 — 4,222 19 3,849 61 Total impaired loans without a related allowance $ 59,064 $ 57,335 $ — $ 61,085 $ 332 $ 64,480 $ 939 Total impaired loans held to maturity: Commercial $ 8,077 $ 6,957 $ 2,166 $ 7,612 $ — $ 5,846 $ 113 Commercial real estate 30,404 27,943 864 28,874 201 33,856 543 Total commercial and commercial real estate 38,481 34,900 3,030 36,486 201 39,702 656 Agricultural and agricultural real estate 12,792 12,792 2,353 11,875 — 12,998 — Residential real estate 29,837 29,833 393 29,189 112 28,203 240 Consumer 6,524 6,524 1,267 6,377 29 6,192 93 Total impaired loans held to maturity $ 87,634 $ 84,049 $ 7,043 $ 83,927 $ 342 $ 87,095 $ 989 Unpaid Contractual Balance Loan Balance Related Allowance Recorded Year-to- Date Avg. Loan Balance Year-to- Date Interest Income Recognized December 31, 2016 Impaired loans with a related allowance: Commercial $ 2,852 $ 2,840 $ 1,318 $ 3,136 $ 2 Commercial real estate 14,221 14,221 2,671 10,625 21 Total commercial and commercial real estate 17,073 17,061 3,989 13,761 23 Agricultural and agricultural real estate 2,771 2,771 816 912 21 Residential real estate 3,490 3,490 497 3,371 43 Consumer 2,644 2,644 1,451 3,082 42 Total impaired loans with a related allowance $ 25,978 $ 25,966 $ 6,753 $ 21,126 $ 129 Impaired loans without a related allowance: Commercial $ 925 $ 872 $ — $ 5,329 $ 251 Commercial real estate 31,875 30,996 — 39,632 1,647 Total commercial and commercial real estate 32,800 31,868 — 44,961 1,898 Agricultural and agricultural real estate 13,959 13,959 — 12,722 157 Residential real estate 22,408 22,236 — 18,446 202 Consumer 3,344 3,344 — 2,659 68 Total impaired loans without a related allowance $ 72,511 $ 71,407 $ — $ 78,788 $ 2,325 Total impaired loans held to maturity: Commercial $ 3,777 $ 3,712 $ 1,318 $ 8,465 $ 253 Commercial real estate 46,096 45,217 2,671 50,257 1,668 Total commercial and commercial real estate 49,873 48,929 3,989 58,722 1,921 Agricultural and agricultural real estate 16,730 16,730 816 13,634 178 Residential real estate 25,898 25,726 497 21,817 245 Consumer 5,988 5,988 1,451 5,741 110 Total impaired loans held to maturity $ 98,489 $ 97,373 $ 6,753 $ 99,914 $ 2,454
Summary of Purchased Impaired and Nonimpaired Loans	At September 30, 2017 , and December 31, 2016 , the carrying amount of loans acquired since 2015 consist of purchased impaired and nonimpaired loans as summarized in the following table, in thousands: September 30, 2017 December 31, 2016 Impaired Non Impaired Total Loans Impaired Non Impaired Total Loans Commercial $ 968 $ 270,241 $ 271,209 $ 2,198 $ 99,082 $ 101,280 Commercial real estate 2,509 1,181,333 1,183,842 2,079 622,117 624,196 Agricultural and agricultural real estate — 1,251 1,251 — 181 181 Residential real estate 211 184,167 184,378 186 157,468 157,654 Consumer loans — 62,491 62,491 — 47,368 47,368 Total loans $ 3,688 $ 1,699,483 $ 1,703,171 $ 4,463 $ 926,216 $ 930,679
Changes in Accretable Yield on Acquired Loans	Changes in accretable yield on acquired loans with evidence of credit deterioration at the date of acquisition for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , were as follows, in thousands: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Balance at beginning of period $ 101 $ 168 $ 182 $ 557 Original yield discount, net, at date of acquisitions — — — 19 Accretion (700 ) (379 ) (1,074 ) (845 ) Reclassification from nonaccretable difference (1) 654 331 947 389 Balance at period end $ 55 $ 120 $ 55 $ 120 (1) Represents increases in estimated cash flows expected to be received, primarily due to lower estimated credit losses.

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Changes in the Allowance for Loan and Leases Losses	Changes in the allowance for loan losses for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , were as follows, in thousands: Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at June 30, 2017 $ 17,168 $ 21,861 $ 3,832 $ 2,263 $ 8,927 $ 54,051 Charge-offs (1,954 ) (1,913 ) — (142 ) (1,750 ) (5,759 ) Recoveries 347 46 14 63 418 888 Provision 1,409 546 2,281 82 1,387 5,705 Balance at September 30, 2017 $ 16,970 $ 20,540 $ 6,127 $ 2,266 $ 8,982 $ 54,885 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at December 31, 2016 $ 14,765 $ 24,319 $ 4,210 $ 2,263 $ 8,767 $ 54,324 Charge-offs (3,310 ) (2,522 ) (888 ) (541 ) (4,982 ) (12,243 ) Recoveries 635 860 17 70 987 2,569 Provision 4,880 (2,117 ) 2,788 474 4,210 10,235 Balance at September 30, 2017 $ 16,970 $ 20,540 $ 6,127 $ 2,266 $ 8,982 $ 54,885 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at June 30, 2016 $ 15,525 $ 22,968 $ 4,100 $ 2,065 $ 7,098 $ 51,756 Charge-offs (240 ) (814 ) — (106 ) (2,123 ) (3,283 ) Recoveries 119 467 2 1 263 852 Provision 1,487 1,060 904 22 1,855 5,328 Balance at September 30, 2016 $ 16,891 $ 23,681 $ 5,006 $ 1,982 $ 7,093 $ 54,653 Commercial Commercial Real Estate Agricultural Residential Real Estate Consumer Total Balance at December 31, 2015 $ 16,095 $ 19,532 $ 3,887 $ 1,934 $ 7,237 $ 48,685 Charge-offs (587 ) (2,229 ) — (248 ) (4,775 ) (7,839 ) Recoveries 438 3,056 9 25 766 4,294 Provision 945 3,322 1,110 271 3,865 9,513 Balance at September 30, 2016 $ 16,891 $ 23,681 $ 5,006 $ 1,982 $ 7,093 $ 54,653

Goodwill, Core Deposit Premiu25

Goodwill, Core Deposit Premium and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets	The gross carrying amount of these intangible assets and the associated accumulated amortization at September 30, 2017 , and December 31, 2016 , are presented in the table below, in thousands: September 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing intangible assets: Core deposit intangibles $ 62,008 $ 25,271 $ 36,737 $ 43,504 $ 21,049 $ 22,455 Customer relationship intangibles 1,177 886 291 1,177 857 320 Mortgage servicing rights 41,903 18,161 23,742 50,467 18,379 32,088 Commercial servicing rights 6,719 3,862 2,857 6,504 2,814 3,690 Total $ 111,807 $ 48,180 $ 63,627 $ 101,652 $ 43,099 $ 58,553
Schedule of Estimated Future Amortization Expense of Amortizable Intangible Assets	The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands: Core Deposit Intangibles Customer Relationship Intangibles Mortgage Servicing Rights Commercial Servicing Rights Total Three months ending December 31, 2017 $ 1,815 $ 10 $ 2,463 $ 184 $ 4,472 Year ending December 31, 2018 6,712 39 5,319 701 12,771 2019 5,915 38 4,560 566 11,079 2020 5,191 37 3,800 442 9,470 2021 4,425 35 3,040 380 7,880 2022 3,391 34 2,280 307 6,012 Thereafter 9,288 98 2,280 277 11,943 Total $ 36,737 $ 291 $ 23,742 $ 2,857 $ 63,627
Summary of Changes in Servicing Rights	The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the nine months ended September 30, 2017 , and September 30, 2016 : 2017 2016 Balance at January 1, $ 3,690 $ 4,611 Purchased commercial servicing rights — 190 Originations 215 533 Amortization (1,077 ) (1,229 ) Valuation allowance on commercial servicing rights 29 (41 ) Balance at period end $ 2,857 $ 4,064 Fair value of commercial servicing rights $ 3,458 $ 4,397 Commercial servicing rights, net to servicing portfolio 1.98 % 2.38 % The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the nine months ended September 30, 2017 , and September 30, 2016 : 2017 2016 Balance at January 1, $ 32,088 $ 30,314 Originations 5,778 9,323 Amortization (7,184 ) (7,795 ) Sale of mortgage servicing rights (6,940 ) — Balance at period end $ 23,742 $ 31,842 Fair value of mortgage servicing rights $ 35,002 $ 38,127 Mortgage servicing rights, net to servicing portfolio 0.67 % 0.75 %
Schedule of Servicing Asset at Fair Value and Amortized Cost	The following table summarizes, in thousands, the book value, the fair value of each tranche of the commercial servicing rights and any recorded valuation allowance at each respective subsidiary at September 30, 2017 , and December 31, 2016 : September 30, 2017 Book Value- Less than 20 Years Fair Value- Less than 20 Years Impairment- Less than 20 Years Book Value- More than 20 Years Fair Value- More than 20 Years Impairment- More than 20 Years Citywide Banks $ 12 $ 15 $ — $ 54 $ 61 $ — Premier Valley Bank 95 124 — 317 313 4 Wisconsin Bank & Trust 515 688 — 1,868 2,257 — Total $ 622 $ 827 $ — $ 2,239 $ 2,631 $ 4 December 31, 2016 Citywide Banks $ 19 $ 23 $ — $ 107 $ 114 $ — Premier Valley Bank 156 180 — 359 326 33 Wisconsin Bank & Trust 833 997 — 2,249 2,487 — Total $ 1,008 $ 1,200 $ — $ 2,715 $ 2,927 $ 33

Derivative Financial Instrume26

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Balance Sheet Category and Fair Values of Derivative Instruments	The table below identifies the balance sheet category and fair values of Heartland's derivative instruments designated as cash flow hedges at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category Receive Rate Weighted Average Pay Rate Maturity September 30, 2017 Interest rate swap $ 25,000 $ (346 ) Other liabilities 1.321 % 2.255 % 03/17/2021 Interest rate swap — — Other liabilities — % 3.220 % 03/01/2017 Interest rate swap 20,000 (828 ) Other liabilities 1.303 % 3.355 % 01/07/2020 Interest rate swap 10,000 (6 ) Other liabilities 1.329 % 1.674 % 03/26/2019 Interest rate swap 10,000 (5 ) Other liabilities 1.321 % 1.658 % 03/18/2019 Interest rate swap 35,667 557 Other assets 3.735 % 3.674 % 05/10/2021 Interest rate swap 20,000 (393 ) Other liabilities 1.320 % 2.390 % 06/15/2024 Interest rate swap 20,000 (365 ) Other liabilities 1.316 % 2.352 % 03/01/2024 December 31, 2016 Interest rate swap $ 25,000 $ (447 ) Other liabilities 0.993 % 2.255 % 03/17/2021 Interest rate swap 20,000 (114 ) Other liabilities 0.931 % 3.220 % 03/01/2017 Interest rate swap 20,000 (1,145 ) Other liabilities 0.868 % 3.355 % 01/07/2020 Interest rate swap 10,000 (42 ) Other liabilities 0.997 % 1.674 % 03/26/2019 Interest rate swap 10,000 (41 ) Other liabilities 0.993 % 1.658 % 03/18/2019 Interest rate swap 37,667 530 Other assets 3.164 % 3.674 % 05/10/2021 Interest rate swap (1) 20,000 (214 ) Other liabilities — % 2.390 % 06/15/2024 Interest rate swap (2) 20,000 (262 ) Other Liabilities — % 2.352 % 03/01/2024 (1) This swap is a forward starting swap with a weighted average pay rate of 2.390% beginning on June 15, 2017. No interest payments were required on this swap until September 15, 2017. (2) This swap is a forward starting swap with a weighted average pay rate of 2.352% beginning on March 1, 2017. No interest payments were required on this swap until June 1, 2017. The table below identifies the balance sheet category and fair values of Heartland's derivative instruments designated as loan swaps at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate September 30, 2017 Customer interest rate swaps $ 90,370 $ 1,906 Other assets 4.75 % 3.91 % Customer interest rate swaps 90,370 (1,906 ) Other liabilities 3.91 % 4.75 % December 31, 2016 Customer interest rate swaps $ 69,594 $ 1,588 Other assets 4.66 % 3.47 % Customer interest rate swaps 69,594 (1,588 ) Other liabilities 3.47 % 4.66 % The table below identifies the notional amount, fair value and balance sheet category of Heartland's fair value hedges at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category September 30, 2017 Fair value hedges $ 35,813 $ (1,537 ) Other liabilities December 31, 2016 Fair value hedges $ 40,807 $ (1,626 ) Other liabilities
Gains (Losses) on Derivative Instruments	The table below identifies the gains and losses recognized on Heartland's derivative instruments designated as cash flow hedges for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) Three Months Ended September 30, 2017 Interest rate swaps $ 325 Interest expense $ (308 ) Other income $ — Nine Months Ended September 30, 2017 Interest rate swaps $ 349 Interest expense $ (1,005 ) Other income $ — Three Months Ended September 30, 2016 Interest rate swaps $ 1,336 Interest expense $ (492 ) Other income $ — Nine Months Ended September 30, 2016 Interest rate swaps $ (3,160 ) Interest expense $ (1,463 ) Other income $ — The table below identifies the gains and losses recognized on Heartland's fair value hedges for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Fair value hedges $ (63 ) Interest income Nine Months Ended September 30, 2017 Fair value hedges $ 89 Interest income Three Months Ended September 30, 2016 Fair value hedges $ (225 ) Interest income Nine Months Ended September 30, 2016 Fair value hedges $ (2,335 ) Interest income
Balance Sheet Category and Fair Values of Embedded Derivatives	The following table identifies, in thousands, the notional amount, fair value, balance sheet category and income statement category for the change in fair value of the embedded conversion option as of September 30, 2017 , and December 31, 2016 : Notional Amount Fair Value Balance Sheet Category September 30, 2017 Embedded conversion option $ — $ — Other liabilities December 31, 2016 Embedded conversion option $ 558 $ (422 ) Other liabilities The table below identifies the gains and losses recognized on Heartland's embedded conversion options for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Embedded conversion option $ 285 Other noninterest income Nine Months Ended September 30, 2017 Embedded conversion option $ 422 Other noninterest income Three Months Ended September 30, 2016 Embedded conversion option $ 435 Other noninterest income Nine Months Ended September 30, 2016 Embedded conversion option $ 138 Other noninterest income The table below identifies the notional amount, fair value and balance sheet category of Heartland's embedded derivatives at September 30, 2017 , and December 31, 2016 , in thousands: Notional Amount Fair Value Balance Sheet Category September 30, 2017 Embedded derivatives $ 14,175 $ 923 Other assets December 31, 2016 Embedded derivatives $ 14,549 $ 1,104 Other assets The table below identifies the gains and losses recognized on Heartland's embedded derivatives for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended September 30, 2017 Embedded derivatives $ (296 ) Other noninterest income Nine Months Ended September 30, 2017 Embedded derivatives $ (181 ) Other noninterest income Three Months Ended September 30, 2016 Embedded derivatives $ (173 ) Other noninterest income Nine Months Ended September 30, 2016 Embedded derivatives $ 243 Other noninterest income
Schedule of Other Derivatives Not Designated as Hedging Instruments, Balance Sheet and Income Category	The table below identifies the balance sheet category and fair values of Heartland's other free standing derivative instruments not designated as hedging instruments at September 30, 2017 , and December 31, 2016 , in thousands: Balance Sheet Category Notional Amount Fair Value September 30, 2017 Interest rate lock commitments (mortgage) Other assets $ 77,910 $ 2,463 Forward commitments Other assets 75,192 237 Forward commitments Other liabilities 91,865 (261 ) Undesignated interest rate swaps Other liabilities 14,175 (923 ) December 31, 2016 Interest rate lock commitments (mortgage) Other assets $ 80,465 $ 2,790 Forward commitments Other assets 142,750 2,546 Forward commitments Other liabilities 59,276 (266 ) Undesignated interest rate swaps Other liabilities 15,564 (1,126 ) The table below identifies the income statement category of the gains and losses recognized in income on Heartland's other free standing derivative instruments not designated as hedging instruments for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Income Statement Category Gain (Loss) Recognized Three Months Ended September 30, 2017 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,245 ) Forward commitments Net gains on sale of loans held for sale 72 Undesignated interest rate swaps Other noninterest income 88 Nine Months Ended September 30, 2017 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (587 ) Forward commitments Net gains on sale of loans held for sale (2,304 ) Undesignated interest rate swaps Other noninterest income 203 Three Months Ended September 30, 2016 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,344 ) Forward commitments Net gains on sale of loans held for sale 931 Undesignated interest rate swaps Other noninterest income 269 Nine Months Ended September 30, 2016 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ 4,464 Forward commitments Net gains on sale of loans held for sale (1,311 ) Undesignated interest rate swaps Other noninterest income (101 )

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The table below presents Heartland's assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2017 , and December 31, 2016 , in thousands, aggregated by the level in the fair value hierarchy within which those measurements fall: Total Fair Value Level 1 Level 2 Level 3 September 30, 2017 Assets Securities available for sale U.S. government corporations and agencies $ 7,415 $ 3,505 $ 3,910 $ — Mortgage-backed securities 1,565,400 — 1,565,400 — Obligations of states and political subdivisions 503,974 — 503,974 — Corporate debt securities — — — — Equity securities 16,596 — 16,596 — Derivative financial instruments (1) 3,386 — 3,386 — Interest rate lock commitments 2,463 — — 2,463 Forward commitments 237 — 237 — Total assets at fair value $ 2,099,471 $ 3,505 $ 2,093,503 $ 2,463 Liabilities Derivative financial instruments (2) $ 6,309 $ — $ 6,309 $ — Forward commitments 261 — 261 — Total liabilities at fair value $ 6,570 $ — $ 6,570 $ — December 31, 2016 Assets Securities available for sale U.S. government corporations and agencies $ 4,700 $ 517 $ 4,183 $ — Mortgage-backed securities 1,290,500 — 1,288,276 2,224 Obligations of states and political subdivisions 536,144 — 536,144 — Equity securities 14,520 — 14,520 — Derivative financial instruments (1) 3,222 — 3,222 — Interest rate lock commitments 2,790 — — 2,790 Forward commitments 2,546 — 2,546 — Total assets at fair value $ 1,854,422 $ 517 $ 1,848,891 $ 5,014 Liabilities Derivative financial instruments (2) $ 7,027 $ — $ 7,027 $ — Forward commitments 266 — 266 — Total liabilities at fair value $ 7,293 $ — $ 7,293 $ — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments
Fair Value Measurements, Nonrecurring	The tables below present Heartland's assets that are measured at fair value on a nonrecurring basis, in thousands: Fair Value Measurements at September 30, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Year-to- Date (Gains) Losses Collateral dependent impaired loans: Commercial $ 3,556 $ — $ — $ 3,556 $ 1,119 Commercial real estate 8,718 — — 8,718 2,043 Agricultural and agricultural real estate 7,936 — — 7,936 — Residential real estate 1,365 — — 1,365 — Consumer 912 — — 912 — Total collateral dependent impaired loans $ 22,487 $ — $ — $ 22,487 $ 3,162 Other real estate owned $ 13,226 $ — $ — $ 13,226 $ 594 Premises, furniture and equipment held for sale $ 4,428 $ — $ — $ 4,428 $ 404 Commercial servicing rights $ 313 $ — $ — $ 313 $ (29 ) Fair Value Measurements at December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Year-to- Collateral dependent impaired loans: Commercial $ 1,683 $ — $ — $ 1,683 $ 41 Commercial real estate 3,026 — — 3,026 527 Agricultural and agricultural real estate 1,955 — — 1,955 — Residential real estate 3,565 — — 3,565 85 Consumer 1,193 — — 1,193 — Total collateral dependent impaired loans $ 11,422 $ — $ — — $ 11,422 $ 653 Other real estate owned $ 9,744 $ — $ — $ 9,744 $ 1,341 Premises, furniture and equipment held for sale $ 414 $ — $ — $ 414 $ 35 Commercial servicing rights $ 326 $ — $ — $ 326 $ 33
Fair Value Inputs, Assets, Quantitative Information	The following tables present additional quantitative information about assets measured at fair value and for which Heartland has utilized Level 3 inputs to determine fair value, in thousands: Fair Value at 9/30/17 Valuation Technique Unobservable Input Range (Weighted Average) Z-TRANCHE Securities $ — Discounted cash flows Pretax discount rate — Actual defaults — Actual deferrals — Interest rate lock commitments 2,463 Discounted cash flows Closing ratio 0-99% (89%) (1) Premises, furniture and equipment held for sale 4,428 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (4) Commercial servicing rights 313 Discounted cash flows Third party valuation (3) Other real estate owned 13,226 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% Collateral dependent impaired loans: Commercial 3,556 Modified appraised value Third party appraisal (2) Appraisal discount 0-15% (4) Commercial real estate 8,718 Modified appraised value Third party appraisal (2) Appraisal discount 0-14% (4) Agricultural and agricultural real estate 7,936 Modified appraised value Third party appraisal (2) Appraisal discount 0-6% (4) Residential real estate 1,365 Modified appraised value Third party appraisal (2) Appraisal discount 0-13% (4) Consumer 912 Modified appraised value Third party valuation (2) Valuation discount 0-11% (4) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (3) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. (4) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. Fair Value at 12/31/16 Valuation Technique Unobservable Input Range (Weighted Average) Z-TRANCHE Securities $ 2,224 Discounted cash flows Pretax discount rate 7.50 - 9.50% Actual defaults 21.77 - 37.62% (33.11%) Actual deferrals 10.44 - 26.29% (14.81%) Interest rate lock commitments 2,790 Discounted cash flows Closing ratio 0-99% (89%) (1) Premises, furniture and equipment held for sale 414 Modified appraised value Third party appraisal (2) 0-8% (4) Commercial servicing rights 326 Discounted cash flows Third party valuation (3) Other real estate owned 9,744 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% Collateral dependent impaired loans: Commercial 1,683 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (4) Commercial real estate 3,026 Modified appraised value Third party appraisal (2) Appraisal discount 0-7% (4) Agricultural and agricultural real estate 1,955 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (4) Residential real estate 3,565 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (4) Consumer 1,193 Modified appraised value Third party valuation (2) Valuation discount 0-11% (4) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (3) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. (4) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The changes in fair value of the Z-TRANCHE securities, Level 3 assets that are measured on a recurring basis, are summarized in the following table, in thousands: For the Nine Months Ended For the Year Ended December 31, 2016 Balance at January 1, $ 2,224 $ 2,039 Total gains (losses): Included in earnings 2,810 — Included in other comprehensive income (2,166 ) 185 Purchases, sales and settlements: Purchases — — Sales (2,868 ) — Settlements — — Balance at period end $ — $ 2,224 The changes in fair value of the interest rate lock commitments, which are Level 3 financial instruments measured on a recurring basis, are summarized in the following table, in thousands: For the Nine Months Ended For the Year Ended December 31, 2016 Balance at January 1, $ 2,790 $ 3,168 Total gains (losses) included in earnings (587 ) (1,564 ) Issuances 1,580 5,373 Settlements (1,320 ) (4,187 ) Balance at period end $ 2,463 $ 2,790
Fair Value, by Balance Sheet Grouping	The following analysis, which is inherently limited in depicting fair value, also does not consider any value associated with either existing customer relationships or the ability of Heartland to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different. Fair Value Measurements at September 30, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 251,736 $ 251,736 $ 251,736 $ — $ — Time deposits in other financial institutions 19,793 19,793 19,793 — — Securities: Available for sale 2,093,385 2,093,385 3,505 2,089,880 — Held to maturity 256,355 270,386 — 270,386 — Other investments 23,176 23,176 — 22,981 195 Loans held for sale 35,795 35,795 — 35,795 — Loans, net: Commercial 1,596,934 1,601,351 — 1,597,795 3,556 Commercial real estate 3,143,414 3,117,829 — 3,109,111 8,718 Agricultural and agricultural real estate 506,388 507,974 — 500,038 7,936 Residential real estate 632,306 622,698 — 621,333 1,365 Consumer 441,079 444,384 — 443,472 912 Total Loans, net 6,320,121 6,294,236 — 6,271,749 22,487 Derivative financial instruments (1) 3,386 3,386 — 3,386 — Interest rate lock commitments 2,463 2,463 — — 2,463 Forward commitments 237 237 — 237 — Financial liabilities: Deposits Demand deposits 3,009,940 3,009,940 — 3,009,940 — Savings deposits 4,227,340 4,227,340 — 4,227,340 — Time deposits 994,604 994,604 — 994,604 — Short term borrowings 171,871 171,871 — 171,871 — Other borrowings 301,473 305,741 — 305,741 — Derivative financial instruments (2) 6,309 6,309 — 6,309 — Forward commitments 261 261 — 261 — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments Fair Value Measurements at December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 158,724 $ 158,724 $ 158,724 $ — $ — Time deposits in other financial institutions 2,105 2,105 2,105 — — Securities: Available for sale 1,845,864 1,845,864 517 1,843,123 2,224 Held to maturity 263,662 274,799 — 274,799 — Other investments 21,560 21,560 — 21,365 195 Loans held for sale 61,261 61,261 — 61,261 — Loans, net: Commercial 1,272,089 1,258,754 — 1,257,071 1,683 Commercial real estate 2,513,446 2,506,858 — 2,503,832 3,026 Agricultural and agricultural real estate 485,820 487,001 — 485,046 1,955 Residential real estate 614,207 604,233 — 600,668 3,565 Consumer 411,833 414,266 — 413,073 1,193 Total Loans, net 5,297,395 5,271,112 — 5,259,690 11,422 Derivative financial instruments (1) 3,222 3,222 — 3,222 — Interest rate lock commitments 2,790 2,790 — — 2,790 Forward commitments 2,546 2,546 — 2,546 — Financial liabilities: Deposits Demand deposits 2,202,036 2,202,036 — 2,202,036 — Savings deposits 3,788,089 3,788,089 — 3,788,089 — Time deposits 857,286 857,286 — 857,286 — Short term borrowings 306,459 306,459 — 306,459 — Other borrowings 288,534 288,534 — 288,534 — Derivative financial instruments (2) 7,027 7,027 — 7,027 — Forward commitments 266 266 — 266 — (1) Includes cash flow hedges, embedded derivatives and back-to-back loan swaps (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded conversion options and free standing derivative instruments

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting	The following tables present financial information for Heartland's operating segments for the three- and nine- month periods ended September 30, 2017 , and September 30, 2016 , in thousands: Three Months Ended 2017 2016 Community and Other Banking Retail Mortgage Banking Total Community and Other Banking Retail Mortgage Banking Total Net interest income $ 88,778 $ 1,066 $ 89,844 $ 72,694 $ 987 $ 73,681 Provision for loan losses 5,705 — 5,705 5,328 — 5,328 Total noninterest income 19,680 5,297 24,977 17,337 11,205 28,542 Total noninterest expense 69,977 8,782 78,759 57,988 10,439 68,427 Income (loss) before taxes $ 32,776 $ (2,419 ) $ 30,357 $ 26,715 $ 1,753 $ 28,468 Average Loans, for the period $ 6,245,445 $ 40,839 $ 6,286,284 $ 5,464,304 $ 73,784 $ 5,538,088 Segment Assets, at period end $ 9,693,172 $ 62,455 $ 9,755,627 $ 8,084,810 $ 117,405 $ 8,202,215 Nine Months Ended 2017 2016 Community Retail Total Community Retail Total Net interest income $ 234,406 $ 3,046 $ 237,452 $ 216,172 $ 3,334 $ 219,506 Provision for loan losses 10,235 — 10,235 9,513 — 9,513 Total noninterest income 56,964 19,530 76,494 55,773 33,373 89,146 Total noninterest expense 193,753 26,044 219,797 177,421 32,335 209,756 Income (loss) before taxes $ 87,382 $ (3,468 ) $ 83,914 $ 85,011 $ 4,372 $ 89,383 Average Loans, for the period $ 5,641,641 $ 37,979 $ 5,679,620 $ 5,422,843 $ 70,344 $ 5,493,187 Segment Assets, at period end $ 9,693,172 $ 62,455 $ 9,755,627 $ 8,084,810 $ 117,405 $ 8,202,215

Basis of Presentation (Earnings

Basis of Presentation (Earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Net income	$ 21,632	$ 20,208	$ 61,600	$ 61,187
Preferred dividends and discount	(13)	(53)	(45)	(273)
Interest expense on convertible preferred debt	3	17	12	48
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 21,622	$ 20,172	$ 61,567	$ 60,962
Weighted average common shares outstanding for basic earnings per share (in shares)	29,648	24,601	27,569	24,262
Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units (in shares)	262	322	265	319
Weighted average common shares for diluted earnings per share (in shares)	29,910	24,923	27,834	24,581
Earnings per common share — basic (in dollars per share)	$ 0.73	$ 0.82	$ 2.23	$ 2.51
Earnings per common share — diluted (in dollars per share)	$ 0.72	$ 0.81	$ 2.21	$ 2.48
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	0	0	0	0

Basis of Presentation (Stock-ba

Basis of Presentation (Stock-based compensation) (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2017shares	Mar. 31, 2016shares	Sep. 30, 2017USD ($)installment$ / sharesshares	Sep. 30, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit from equity based awards | $			$ 1,100,000	$ 1,100,000
Options granted (in shares) | shares			0	0
Vested options (in shares) | shares			12,250	69,200
Vested options, weighted average exercise price (in dollars per share) | $ / shares			$ 18.60	$ 23.55
Vested options, weighted average remaining contractual life			3 months 25 days
Intrinsic value for vested options | $			$ 377,000
Intrinsic value for the total of all options exercised | $			$ 379,000
Maximum exercise period			10 years
Cash received from options exercised | $			$ 254,000	$ 1,400,000
Options vested during period (in shares) | shares			0	0
Prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Typical options expiration period after date of grant			10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs | $			$ 3,600,000	$ 3,100,000
Share-based unrecognized compensation costs | $			4,300,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs | $			0	$ 0
Share-based unrecognized compensation costs | $			$ 0
Stock Options | Prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods			5 years
Stock Options | Period One | Prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods			3 years
Stock Options | Period Two | Prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods			4 years
Stock Options | Period Three | Prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods			5 years
Long-Term Incentive Plan 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares for issuance under future awards (in shares) | shares			499,656
Long-Term Incentive Plan 2012 | Time-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares) | shares	55,665	72,644
Number of equal installments | installment			3
Long-Term Incentive Plan 2012 | Performance-Based RSUs | End of Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares) | shares	27,570	35,516
Long-Term Incentive Plan 2012 | Performance-Based RSUs | 2018 and 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares) | shares	9,032	11,408
Share-based compensation, award vesting periods			3 years
Long-Term Incentive Plan 2012 | RSUs granted on or after March 8, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting period after change in control			2 years
Long-Term Incentive Plan 2012 | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares) | shares			16,804	24,153

Basis of Presentation (Summary

Basis of Presentation (Summary of RSUs activity) (Details) - RSUs - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Shares
Outstanding at beginning of period (in shares)	346,817	353,195
Granted (in shares)	109,071	143,721
Vested (in shares)	(136,428)	(117,898)
Forfeited (in shares)	(12,923)	(11,547)
Outstanding at end of period (in shares)	306,537	367,471
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 27.61	$ 25.53
Granted (in dollars per share)	47.21	29.75
Vested (in dollars per share)	26.66	23.44
Forfeited (in dollars per share)	31.57	27.12
Outstanding at end of period (in dollars per share)	$ 34.72	$ 27.60

Basis of Presentation (Summar32

Basis of Presentation (Summary of stock options activity) (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Shares
Outstanding at beginning of period (in shares)	26,400	125,950
Granted (in shares)	0	0
Exercised (in shares)	(13,650)	(55,250)
Forfeited (in shares)	(500)	(1,500)
Outstanding at end of period (in shares)	12,250	69,200
Options exercisable at end of period (in shares)	12,250	69,200
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 18.60	$ 24.08
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	18.60	24.82
Forfeited (in dollars per share)	18.60	21.10
Outstanding at end of period (in dollars per share)	18.60	23.55
Options exercisable at end of period (in dollars per share)	$ 18.60	$ 23.55

Basis of Presentation (New Fina

Basis of Presentation (New Financial Accounting Standards) (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash from operating activities		$ 129,857	$ 96,676
Decrease in net cash from financing activities		$ 193,492	322,128
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in tax expense	$ 1,100
Increase in cash from operating activities			1,100
Decrease in net cash from financing activities			$ 1,100

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) $ in Thousands	Jul. 07, 2017USD ($)buildingshares	Feb. 28, 2017USD ($)buildingshares	Feb. 05, 2016USD ($)shares	Jun. 30, 2017USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)
Business Acquisition [Line Items]
Assets					$ 9,755,627	$ 8,247,079	$ 8,202,215
Loans outstanding					6,318,530	5,297,395
Deposits					8,231,884	6,847,411
Goodwill					236,615	127,699
Nonaccrual loans					59,451	$ 62,591
Citywide Banks
Business Acquisition [Line Items]
Purchase price	$ 211,243
Purchase price in cash	$ 58,636
Purchase price paid by delivery of shares of common stock (in shares) | shares	3,216,161
Assets	$ 1,490,000
Loans outstanding	985,400
Deposits	1,210,000
Goodwill	$ 95,154
Merger related expenses					3,800
Nonaccrual loans					$ 1,100
Number of bank buildings sold (building) | building	1
Fair value of buildings sold	$ 1,400
Stock issued	152,607
Other borrowings	$ 21,636
Citywide Banks | Common Stock
Business Acquisition [Line Items]
Purchase price paid by delivery of shares of common stock (in shares) | shares	3,216,161
Founders Bancorp
Business Acquisition [Line Items]
Purchase price		$ 31,000
Purchase price in cash		$ 8,400
Purchase price paid by delivery of shares of common stock (in shares) | shares		455,877
Assets		$ 213,900
Deposits		181,500
Goodwill		13,800
Loans		$ 96,400
Number of bank buildings sold (building) | building		1
Fair value of buildings sold				$ 576
Founders Bancorp | Common Stock
Business Acquisition [Line Items]
Purchase price paid by delivery of shares of common stock (in shares) | shares		455,877
CIC Bancshares, Inc.
Business Acquisition [Line Items]
Purchase price			$ 76,900
Purchase price in cash			$ 15,700
Purchase price paid by delivery of shares of common stock (in shares) | shares			2,003,235
Assets			$ 772,600
Deposits			648,100
Goodwill			29,800
Loans			581,500
Other borrowings			7,900
CIC Bancshares, Inc. | Preferred Stock
Business Acquisition [Line Items]
Stock issued			$ 3,800
CIC Bancshares, Inc. | Common Stock
Business Acquisition [Line Items]
Purchase price paid by delivery of shares of common stock (in shares) | shares			2,003,235

Acquisitions (Acquisitions fair

Acquisitions (Acquisitions fair values) (Details) - USD ($) $ in Thousands	Jul. 07, 2017	Sep. 30, 2017	Dec. 31, 2016
Fair value of liabilities assumed
Goodwill resulting from acquisition		$ 236,615	$ 127,699
Citywide Banks
Fair value of consideration paid
Common stock	$ 152,607
Common stock (in shares)	3,216,161
Cash	$ 58,636
Total consideration paid	211,243
Fair value of assets acquired
Cash and due from banks	21,341
Interest bearing deposits in other financial institutions	74,686
Time deposits in other financial institutions	6,304
Securities
Securities available for sale	234,390
Other securities	2,628
Loans held to maturity	985,399
Premises, furniture and equipment, net	17,206
Premises, furniture and equipment held for sale	1,350
Other real estate, net	6,916
Other intangible assets, net	16,041
Other assets	32,278
Total assets	1,398,539
Fair value of liabilities assumed
Deposits	1,210,074
Short term borrowings	34,445
Other borrowings	21,636
Other liabilities	16,295
Total liabilities assumed	1,282,450
Fair value of net assets acquired	116,089
Goodwill resulting from acquisition	$ 95,154

Acquisitions (Pro forma) (Detai

Acquisitions (Pro forma) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Net income	$ 21,632	$ 20,208	$ 61,600	$ 61,187
Citywide Banks
Business Acquisition [Line Items]
Net interest income			264,485	256,579
Net income available to common stockholders			$ 61,940	$ 68,857
Basic earnings per share (in dollars per share)			$ 2.08	$ 2.51
Diluted earnings per share (in dollars per share)			$ 2.06	$ 2.48
Transaction costs			$ 3,800
Citywide Banks | Acquisition-related Costs
Business Acquisition [Line Items]
Net income			$ (10,100)

Securities (Securities availabl

Securities (Securities available for sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,124,232	$ 1,893,947
Gross Unrealized Gains	9,320	9,547
Gross Unrealized Losses	(40,167)	(57,630)
Estimated Fair Value	2,093,385	1,845,864
Total debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,107,979	1,879,496
Gross Unrealized Gains	8,977	9,478
Gross Unrealized Losses	(40,167)	(57,630)
Estimated Fair Value	2,076,789	1,831,344
U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,435	4,716
Gross Unrealized Gains	14	16
Gross Unrealized Losses	(34)	(32)
Estimated Fair Value	7,415	4,700
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,593,677	1,321,760
Gross Unrealized Gains	4,656	7,026
Gross Unrealized Losses	(32,933)	(38,286)
Estimated Fair Value	1,565,400	1,290,500
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	506,867	553,020
Gross Unrealized Gains	4,307	2,436
Gross Unrealized Losses	(7,200)	(19,312)
Estimated Fair Value	503,974	536,144
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,253	14,451
Gross Unrealized Gains	343	69
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 16,596	$ 14,520

Securities (Held to maturity se

Securities (Held to maturity securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 256,355	$ 263,662
Gross Unrealized Gains	14,722	12,282
Gross Unrealized Losses	(691)	(1,145)
Estimated Fair Value	270,386	274,799
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	256,355	263,662
Gross Unrealized Gains	14,722	12,282
Gross Unrealized Losses	(691)	(1,145)
Estimated Fair Value	$ 270,386	$ 274,799

Securities (Other securities) (

Securities (Other securities) (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Fair value of securities pledged	$ 758.1	$ 810.6
FHLB	$ 14	$ 14.4
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Investment [Line Items]
Percentage of mortgage-backed securities issued by government-sponsored enterprises	74.00%

Securities (Other-than-temporar

Securities (Other-than-temporary impairments) (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Gross realized gains on available-for-sale securities			$ 0	$ 0
Gross realized losses on available-for-sale securities	$ 409,000	$ 177,000	$ 3,023,000	1,332,000
Realized gross gains (losses) on held to maturity securities				0
Mortgage Backed Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Gross realized losses on available-for-sale securities				85,000
Realized gross gains (losses) on held to maturity securities				$ (439,000)

Securities (Securities availa41

Securities (Securities available for sale (debt maturities)) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost
Due in 1 year or less	$ 185
Due in 1 to 5 years	40,716
Due in 5 to 10 years	93,240
Due after 10 years	380,161
Total debt securities	514,302
Mortgage-backed securities	1,593,677
Equity securities	16,253
Amortized Cost	2,124,232	$ 1,893,947
Estimated Fair Value
Due in 1 year or less	186
Due in 1 to 5 years	41,077
Due in 5 to 10 years	91,514
Due after 10 years	378,612
Total debt securities	511,389
Mortgage-backed securities	1,565,400
Equity securities	16,596
Estimated Fair Value	$ 2,093,385	$ 1,845,864

Securities (Securities held to

Securities (Securities held to maturity (debt maturities)) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost
Due in 1 year or less	$ 1,510
Due in 1 to 5 years	21,157
Due in 5 to 10 years	105,030
Due after 10 years	128,658
Amortized Cost	256,355	$ 263,662
Estimated Fair Value
Due in 1 year or less	1,533
Due in 1 to 5 years	22,090
Due in 5 to 10 years	109,119
Due after 10 years	137,644
Estimated Fair Value	$ 270,386	$ 274,799

Securities (Realized gain (loss

Securities (Realized gain (loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 503,083	$ 146,242	$ 1,127,091	$ 768,617
Gross security gains	2,088	1,763	8,585	11,416
Gross security losses	$ 409	$ 177	$ 3,023	$ 1,332

Securities (Available for sale

Securities (Available for sale securities losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value
Less than 12 months	$ 918,067	$ 1,162,538
12 months or longer	584,737	272,700
Total	1,502,804	1,435,238
Unrealized Losses
Less than 12 months	(13,412)	(42,868)
12 months or longer	(26,755)	(14,762)
Total	(40,167)	(57,630)
Total debt securities
Fair Value
Less than 12 months	918,067	1,162,538
12 months or longer	584,737	272,700
Total	1,502,804	1,435,238
Unrealized Losses
Less than 12 months	(13,412)	(42,868)
12 months or longer	(26,755)	(14,762)
Total	(40,167)	(57,630)
U.S. government corporations and agencies
Fair Value
Less than 12 months	6,901	4,185
12 months or longer	0	0
Total	6,901	4,185
Unrealized Losses
Less than 12 months	(34)	(32)
12 months or longer	0	0
Total	(34)	(32)
Mortgage-backed securities
Fair Value
Less than 12 months	761,235	744,202
12 months or longer	431,669	272,449
Total	1,192,904	1,016,651
Unrealized Losses
Less than 12 months	(11,558)	(23,527)
12 months or longer	(21,375)	(14,759)
Total	(32,933)	(38,286)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	149,931	414,151
12 months or longer	153,068	251
Total	302,999	414,402
Unrealized Losses
Less than 12 months	(1,820)	(19,309)
12 months or longer	(5,380)	(3)
Total	(7,200)	(19,312)
Equity securities
Fair Value
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
Unrealized Losses
Less than 12 months	0	0
12 months or longer	0	0
Total	$ 0	$ 0

Securities (Held to maturity 45

Securities (Held to maturity securities losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value
Less than 12 months	$ 6,278	$ 31,479
12 months or longer	8,894	2,017
Total	15,172	33,496
Unrealized Losses
Less than 12 months	(43)	(884)
12 months or longer	(648)	(261)
Total	(691)	(1,145)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	6,278	31,479
12 months or longer	8,894	2,017
Total	15,172	33,496
Unrealized Losses
Less than 12 months	(43)	(884)
12 months or longer	(648)	(261)
Total	$ (691)	$ (1,145)

Securities (Other-than-tempor46

Securities (Other-than-temporary impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Recorded as part of gross realized losses:
Credit related OTTI	$ 0	$ 0	$ 0	$ 0
Intent to sell OTTI	0	0	0	0
Total recorded as part of gross realized losses	0	0	0	0
Recorded directly to AOCI for non-credit related impairment:
Residential mortgage backed securities	0	0	0	0
Reduction of non-credit related impairment related to security sales	0	0	0	(120)
Accretion of non-credit related impairment	0	0	0	(7)
Total changes to AOCI for non-credit related impairment	0	0	0	(127)
Total OTTI losses (accretion) recorded on debt securities, net	$ 0	$ 0	$ 0	$ (127)

Loans (Loans receivable) (Detai

Loans (Loans receivable) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Loans and Leases [Line Items]
Gross loans receivable held to maturity	$ 6,375,319	$ 5,353,702
Unearned discount	(605)	(699)
Deferred loan fees	(1,299)	(1,284)
Total net loans receivable held to maturity	6,373,415	5,351,719
Allowance for loan losses	(54,885)	(54,324)
Loans receivable, net	6,318,530	5,297,395
Loans secured by residential real estate property in process of foreclosure	$ 4,800
Threshold period past due, nonperforming status of loans and leases	90 days
Commercial
Loans and Leases [Line Items]
Gross loans receivable held to maturity	$ 4,777,856	3,825,847
Commercial | Minimum
Loans and Leases [Line Items]
Length of loan agreements	1 year
Commercial | Maximum
Loans and Leases [Line Items]
Length of loan agreements	5 years
Commercial | Commercial
Loans and Leases [Line Items]
Gross loans receivable held to maturity	$ 1,613,903	1,287,265
Commercial | Commercial real estate
Loans and Leases [Line Items]
Gross loans receivable held to maturity	3,163,953	2,538,582
Agricultural and agricultural real estate
Loans and Leases [Line Items]
Gross loans receivable held to maturity	511,764	489,318
Residential real estate
Loans and Leases [Line Items]
Gross loans receivable held to maturity	$ 635,611	617,924
Residential real estate | Minimum
Loans and Leases [Line Items]
Length of loan agreements	10 years
Residential real estate | Maximum
Loans and Leases [Line Items]
Length of loan agreements	30 years
Consumer
Loans and Leases [Line Items]
Gross loans receivable held to maturity	$ 450,088	$ 420,613
Consumer | Loans and Finance Receivables | Citizens Finance Co
Loans and Leases [Line Items]
Concentration risk, percentage	17.00%

Loans (Allowance for credit los

Loans (Allowance for credit losses on financing receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	$ 7,043		$ 6,753
Ending Balance Under ASC 450-20	47,842		47,571
Total	54,885	$ 54,051	54,324	$ 54,653	$ 51,756	$ 48,685
Ending Balance Evaluated for Impairment Under ASC 310-10-35	84,049		97,373
Ending Balance Evaluated for Impairment Under ASC 450-20	6,291,270		5,256,329
Total	6,375,319		5,353,702
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,777,856		3,825,847
Commercial | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	2,166		1,318
Ending Balance Under ASC 450-20	14,804		13,447
Total	16,970	17,168	14,765	16,891	15,525	16,095
Ending Balance Evaluated for Impairment Under ASC 310-10-35	6,957		3,712
Ending Balance Evaluated for Impairment Under ASC 450-20	1,606,946		1,283,553
Total	1,613,903		1,287,265
Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	864		2,671
Ending Balance Under ASC 450-20	19,676		21,648
Total	20,540	21,861	24,319	23,681	22,968	19,532
Ending Balance Evaluated for Impairment Under ASC 310-10-35	27,943		45,217
Ending Balance Evaluated for Impairment Under ASC 450-20	3,136,010		2,493,365
Total	3,163,953		2,538,582
Agricultural and agricultural real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	2,353		816
Ending Balance Under ASC 450-20	3,774		3,394
Total	6,127	3,832	4,210	5,006	4,100	3,887
Ending Balance Evaluated for Impairment Under ASC 310-10-35	12,792		16,730
Ending Balance Evaluated for Impairment Under ASC 450-20	498,972		472,588
Total	511,764		489,318
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	393		497
Ending Balance Under ASC 450-20	1,873		1,766
Total	2,266	2,263	2,263	1,982	2,065	1,934
Ending Balance Evaluated for Impairment Under ASC 310-10-35	29,833		25,726
Ending Balance Evaluated for Impairment Under ASC 450-20	605,778		592,198
Total	635,611		617,924
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance Under ASC 310-10-35	1,267		1,451
Ending Balance Under ASC 450-20	7,715		7,316
Total	8,982	$ 8,927	8,767	$ 7,093	$ 7,098	$ 7,237
Ending Balance Evaluated for Impairment Under ASC 310-10-35	6,524		5,988
Ending Balance Evaluated for Impairment Under ASC 450-20	443,564		414,625
Total	$ 450,088		$ 420,613

Loans (Financing receivables, n

Loans (Financing receivables, non accrual status) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Nonaccrual loans	$ 59,451	$ 62,591
Nonaccrual troubled debt restructured loans	4,005	1,708
Total nonaccrual loans	63,456	64,299
Accruing loans past due 90 days or more	2,348	86
Performing troubled debt restructured loans	$ 10,040	$ 10,380

Loans (Troubled debt restructur

Loans (Troubled debt restructuring) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)loan	Sep. 30, 2016USD ($)loan	Sep. 30, 2017USD ($)loan	Sep. 30, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	8	5	25	7
Pre- Modification Recorded Investment	$ 1,174	$ 651	$ 3,108	$ 930
Post- Modification Recorded Investment	$ 1,174	$ 651	$ 3,108	$ 930
With Payment Defaults During the Following Periods
Number of Loans | loan	5	0	8	1
Recorded Investment	$ 1,221	$ 0	$ 1,480	$ 95
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	3	2
Pre- Modification Recorded Investment	$ 0	$ 0	$ 131	$ 279
Post- Modification Recorded Investment	$ 0	$ 0	$ 131	$ 279
With Payment Defaults During the Following Periods
Number of Loans | loan	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 95
Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	3	1
Pre- Modification Recorded Investment	$ 0	$ 0	$ 131	$ 100
Post- Modification Recorded Investment	$ 0	$ 0	$ 131	$ 100
With Payment Defaults During the Following Periods
Number of Loans | loan	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 95
Commercial | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	1
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 179
Post- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 179
With Payment Defaults During the Following Periods
Number of Loans | loan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Agricultural and agricultural real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
With Payment Defaults During the Following Periods
Number of Loans | loan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	8	5	22	5
Pre- Modification Recorded Investment	$ 1,174	$ 651	$ 2,977	$ 651
Post- Modification Recorded Investment	$ 1,174	$ 651	$ 2,977	$ 651
With Payment Defaults During the Following Periods
Number of Loans | loan	5	0	8	0
Recorded Investment	$ 1,221	$ 0	$ 1,480	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
With Payment Defaults During the Following Periods
Number of Loans | loan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0

Loans (Troubled debt) (Narrativ

Loans (Troubled debt) (Narrative) (Details) $ in Thousands	Sep. 30, 2017USD ($)loan	Dec. 31, 2016USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans including uncollectible balance	$ 9,600
Gross loans receivable held to maturity	6,375,319	$ 5,353,702
Allowance for credit losses	$ 54,885	$ 54,324
Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Number of loan relationships | loan	1
Gross loans receivable held to maturity	$ 2,200
Allowance for credit losses	$ 2,200
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Number of loan relationships | loan	0

Loans (Credit quality indicator

Loans (Credit quality indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	$ 6,375,319	$ 5,353,702
Loans delinquent 30 to 89 days, percentage	0.33%	0.37%
Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	$ 5,997,115	$ 4,985,600
Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	$ 378,204	$ 368,102
Percent of nonaccrual loans	17.00%	17.00%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	48.00%	47.00%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	52.00%	53.00%
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	$ 4,777,856	$ 3,825,847
Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	4,515,743	3,567,189
Commercial | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	262,113	258,658
Commercial | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	1,613,903	1,287,265
Commercial | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	1,523,080	1,187,557
Commercial | Commercial | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	90,823	99,708
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	3,163,953	2,538,582
Commercial | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	2,992,663	2,379,632
Commercial | Commercial real estate | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	171,290	158,950
Agricultural and agricultural real estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	511,764	489,318
Agricultural and agricultural real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	445,554	424,311
Agricultural and agricultural real estate | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	66,210	65,007
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	635,611	617,924
Residential real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	597,987	584,626
Residential real estate | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	37,624	33,298
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	450,088	420,613
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	437,831	409,474
Consumer | Nonpass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans receivable held to maturity	$ 12,257	$ 11,139

Loans (Past due financing recei

Loans (Past due financing receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	$ 23,070	$ 19,945
Accruing Loans and Leases, Current	6,288,793	5,269,458
Nonaccrual	63,456	64,299
Total	6,375,319	5,353,702
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	17,080	10,653
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	3,642	9,206
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	2,348	86
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	9,544	6,238
Accruing Loans and Leases, Current	4,744,069	3,794,310
Nonaccrual	24,243	25,299
Total	4,777,856	3,825,847
Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	8,731	2,013
Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	598	4,148
Commercial | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	215	77
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	2,939	1,423
Accruing Loans and Leases, Current	1,603,397	1,281,241
Nonaccrual	7,567	4,601
Total	1,613,903	1,287,265
Commercial | Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	2,591	1,127
Commercial | Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	133	219
Commercial | Commercial | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	215	77
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	6,605	4,815
Accruing Loans and Leases, Current	3,140,672	2,513,069
Nonaccrual	16,676	20,698
Total	3,163,953	2,538,582
Commercial | Commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	6,140	886
Commercial | Commercial real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	465	3,929
Commercial | Commercial real estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	0	0
Agricultural and agricultural real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	2,379	3,390
Accruing Loans and Leases, Current	496,593	472,597
Nonaccrual	12,792	13,331
Total	511,764	489,318
Agricultural and agricultural real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	315	199
Agricultural and agricultural real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	782	3,191
Agricultural and agricultural real estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	1,282	0
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	5,482	5,832
Accruing Loans and Leases, Current	607,165	590,626
Nonaccrual	22,964	21,466
Total	635,611	617,924
Residential real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	5,033	4,986
Residential real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	449	846
Residential real estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	0	0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	5,665	4,485
Accruing Loans and Leases, Current	440,966	411,925
Nonaccrual	3,457	4,203
Total	450,088	420,613
Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	3,001	3,455
Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	1,813	1,021
Consumer | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans and Leases, Past Due	$ 851	$ 9

Loans (Impaired loans) (Details

Loans (Impaired loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Unpaid Contractual Balance
Total impaired loans with a related allowance	$ 28,570	$ 28,570	$ 25,978
Total impaired loans without a related allowance	59,064	59,064	72,511
Total impaired loans held to maturity	87,634	87,634	98,489
Loan Balance
Total impaired loans with a related allowance	26,714	26,714	25,966
Total impaired loans without a related allowance	57,335	57,335	71,407
Total impaired loans held to maturity	84,049	84,049	97,373
Related Allowance Recorded	7,043	7,043	6,753
Average Loan Balance
Total impaired loans with a related allowance	22,842	22,615	21,126
Total impaired loans without a related allowance	61,085	64,480	78,788
Total impaired loans held to maturity	83,927	87,095	99,914
Interest Income Recognized
Total impaired loans with a related allowance	10	50	129
Total impaired loans without a related allowance	332	939	2,325
Total impaired loans held to maturity	342	989	2,454
Commercial
Unpaid Contractual Balance
Total impaired loans with a related allowance	14,462	14,462	17,073
Total impaired loans without a related allowance	24,019	24,019	32,800
Total impaired loans held to maturity	38,481	38,481	49,873
Loan Balance
Total impaired loans with a related allowance	12,606	12,606	17,061
Total impaired loans without a related allowance	22,294	22,294	31,868
Total impaired loans held to maturity	34,900	34,900	48,929
Related Allowance Recorded	3,030	3,030	3,989
Average Loan Balance
Total impaired loans with a related allowance	15,522	15,935	13,761
Total impaired loans without a related allowance	20,964	23,767	44,961
Total impaired loans held to maturity	36,486	39,702	58,722
Interest Income Recognized
Total impaired loans with a related allowance	0	8	23
Total impaired loans without a related allowance	201	648	1,898
Total impaired loans held to maturity	201	656	1,921
Commercial | Commercial
Unpaid Contractual Balance
Total impaired loans with a related allowance	3,190	3,190	2,852
Total impaired loans without a related allowance	4,887	4,887	925
Total impaired loans held to maturity	8,077	8,077	3,777
Loan Balance
Total impaired loans with a related allowance	3,190	3,190	2,840
Total impaired loans without a related allowance	3,767	3,767	872
Total impaired loans held to maturity	6,957	6,957	3,712
Related Allowance Recorded	2,166	2,166	1,318
Average Loan Balance
Total impaired loans with a related allowance	4,885	3,829	3,136
Total impaired loans without a related allowance	2,727	2,017	5,329
Total impaired loans held to maturity	7,612	5,846	8,465
Interest Income Recognized
Total impaired loans with a related allowance	0	1	2
Total impaired loans without a related allowance	0	112	251
Total impaired loans held to maturity	0	113	253
Commercial | Commercial real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	11,272	11,272	14,221
Total impaired loans without a related allowance	19,132	19,132	31,875
Total impaired loans held to maturity	30,404	30,404	46,096
Loan Balance
Total impaired loans with a related allowance	9,416	9,416	14,221
Total impaired loans without a related allowance	18,527	18,527	30,996
Total impaired loans held to maturity	27,943	27,943	45,217
Related Allowance Recorded	864	864	2,671
Average Loan Balance
Total impaired loans with a related allowance	10,637	12,106	10,625
Total impaired loans without a related allowance	18,237	21,750	39,632
Total impaired loans held to maturity	28,874	33,856	50,257
Interest Income Recognized
Total impaired loans with a related allowance	0	7	21
Total impaired loans without a related allowance	201	536	1,647
Total impaired loans held to maturity	201	543	1,668
Agricultural and agricultural real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	10,289	10,289	2,771
Total impaired loans without a related allowance	2,503	2,503	13,959
Total impaired loans held to maturity	12,792	12,792	16,730
Loan Balance
Total impaired loans with a related allowance	10,289	10,289	2,771
Total impaired loans without a related allowance	2,503	2,503	13,959
Total impaired loans held to maturity	12,792	12,792	16,730
Related Allowance Recorded	2,353	2,353	816
Average Loan Balance
Total impaired loans with a related allowance	3,532	2,140	912
Total impaired loans without a related allowance	8,343	10,858	12,722
Total impaired loans held to maturity	11,875	12,998	13,634
Interest Income Recognized
Total impaired loans with a related allowance	0	0	21
Total impaired loans without a related allowance	0	0	157
Total impaired loans held to maturity	0	0	178
Residential real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	1,640	1,640	3,490
Total impaired loans without a related allowance	28,197	28,197	22,408
Total impaired loans held to maturity	29,837	29,837	25,898
Loan Balance
Total impaired loans with a related allowance	1,640	1,640	3,490
Total impaired loans without a related allowance	28,193	28,193	22,236
Total impaired loans held to maturity	29,833	29,833	25,726
Related Allowance Recorded	393	393	497
Average Loan Balance
Total impaired loans with a related allowance	1,633	2,197	3,371
Total impaired loans without a related allowance	27,556	26,006	18,446
Total impaired loans held to maturity	29,189	28,203	21,817
Interest Income Recognized
Total impaired loans with a related allowance	0	10	43
Total impaired loans without a related allowance	112	230	202
Total impaired loans held to maturity	112	240	245
Consumer
Unpaid Contractual Balance
Total impaired loans with a related allowance	2,179	2,179	2,644
Total impaired loans without a related allowance	4,345	4,345	3,344
Total impaired loans held to maturity	6,524	6,524	5,988
Loan Balance
Total impaired loans with a related allowance	2,179	2,179	2,644
Total impaired loans without a related allowance	4,345	4,345	3,344
Total impaired loans held to maturity	6,524	6,524	5,988
Related Allowance Recorded	1,267	1,267	1,451
Average Loan Balance
Total impaired loans with a related allowance	2,155	2,343	3,082
Total impaired loans without a related allowance	4,222	3,849	2,659
Total impaired loans held to maturity	6,377	6,192	5,741
Interest Income Recognized
Total impaired loans with a related allowance	10	32	42
Total impaired loans without a related allowance	19	61	68
Total impaired loans held to maturity	$ 29	$ 93	$ 110

Loans (Purchased impaired loans

Loans (Purchased impaired loans) (Narrative) (Details) - USD ($) $ in Millions	Jul. 07, 2017	Feb. 28, 2017	Feb. 05, 2016
Citywide Banks
Financing Receivable, Impaired [Line Items]
Loans	$ 1,000
Loans held to maturity	$ 985.4
Founders Bancorp
Financing Receivable, Impaired [Line Items]
Loans		$ 98.9
Loans held to maturity		$ 96.4
CIC Bancshares, Inc.
Financing Receivable, Impaired [Line Items]
Loans			$ 594.9
Loans held to maturity			$ 581.5

Loans (Carrying amount loans) (

Loans (Carrying amount loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	$ 3,688	$ 4,463
Non Impaired Purchased Loans	1,699,483	926,216
Total Purchased Loans	1,703,171	930,679
Commercial | Commercial
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	968	2,198
Non Impaired Purchased Loans	270,241	99,082
Total Purchased Loans	271,209	101,280
Commercial | Commercial real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	2,509	2,079
Non Impaired Purchased Loans	1,181,333	622,117
Total Purchased Loans	1,183,842	624,196
Agricultural and agricultural real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	1,251	181
Total Purchased Loans	1,251	181
Residential real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	211	186
Non Impaired Purchased Loans	184,167	157,468
Total Purchased Loans	184,378	157,654
Consumer
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	62,491	47,368
Total Purchased Loans	$ 62,491	$ 47,368

Loans (Change in accretable yie

Loans (Change in accretable yield) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 101	$ 168	$ 182	$ 557
Original yield discount, net, at date of acquisitions	0	0	0	19
Accretion	(700)	(379)	(1,074)	(845)
Reclassification from nonaccretable difference	654	331	947	389
Balance at end of period	$ 55	$ 120	$ 55	$ 120

Loans (Carrying amount loans)58

Loans (Carrying amount loans) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 07, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 54,885		$ 54,885			$ 54,324
Provision for loan losses	5,705	$ 5,328	10,235	$ 9,513
Citywide Banks
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans					$ 1,000,000
Estimated fair value of the loans acquired					$ 985,400
2015, 2016 and 2017 Acquisitions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	22,200		22,200
Estimated fair value of loans acquired	13,100		13,100
Allowance for loan and lease losses	132		132			$ 588
Provision for loan losses	4	$ 126	5	$ 517
Contractually required payments receivable of nonimpaired loans	2,660,000		2,660,000
Estimated fair value of nonimpaired loans acquired	$ 2,590,000		$ 2,590,000

Allowance for Loan Losses (Deta

Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 54,051	$ 51,756	$ 54,324	$ 48,685
Charge-offs	(5,759)	(3,283)	(12,243)	(7,839)
Recoveries	888	852	2,569	4,294
Provision	5,705	5,328	10,235	9,513
Ending Balance	54,885	54,653	54,885	54,653
Agricultural and agricultural real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	3,832	4,100	4,210	3,887
Charge-offs	0	0	(888)	0
Recoveries	14	2	17	9
Provision	2,281	904	2,788	1,110
Ending Balance	6,127	5,006	6,127	5,006
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,263	2,065	2,263	1,934
Charge-offs	(142)	(106)	(541)	(248)
Recoveries	63	1	70	25
Provision	82	22	474	271
Ending Balance	2,266	1,982	2,266	1,982
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	8,927	7,098	8,767	7,237
Charge-offs	(1,750)	(2,123)	(4,982)	(4,775)
Recoveries	418	263	987	766
Provision	1,387	1,855	4,210	3,865
Ending Balance	8,982	7,093	8,982	7,093
Commercial | Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	17,168	15,525	14,765	16,095
Charge-offs	(1,954)	(240)	(3,310)	(587)
Recoveries	347	119	635	438
Provision	1,409	1,487	4,880	945
Ending Balance	16,970	16,891	16,970	16,891
Commercial real estate | Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	21,861	22,968	24,319	19,532
Charge-offs	(1,913)	(814)	(2,522)	(2,229)
Recoveries	46	467	860	3,056
Provision	546	1,060	(2,117)	3,322
Ending Balance	$ 20,540	$ 23,681	$ 20,540	$ 23,681

Goodwill, Core Deposit Premiu60

Goodwill, Core Deposit Premium and Other Intangible Assets (Goodwill) (Narrative) (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2017	Jul. 07, 2017	Feb. 28, 2017	Dec. 31, 2016	Feb. 05, 2016
Goodwill [Line Items]
Goodwill	$ 236,615,000	$ 236,615,000			$ 127,699,000
Goodwill impairment	$ 0
Core Deposits
Goodwill [Line Items]
Intangibles, amortization period		10 years
Citywide Banks
Goodwill [Line Items]
Goodwill			$ 95,154,000
Citywide Banks | Core Deposits
Goodwill [Line Items]
Intangibles recognized			$ 16,000,000
Founders Bancorp
Goodwill [Line Items]
Goodwill				$ 13,800,000
Founders Bancorp | Core Deposits
Goodwill [Line Items]
Intangibles recognized				$ 2,500,000
CIC Bancshares, Inc.
Goodwill [Line Items]
Goodwill						$ 29,800,000
CIC Bancshares, Inc. | Core Deposits
Goodwill [Line Items]
Intangibles recognized						6,400,000
CIC Bancshares, Inc. | Commercial Servicing Rights
Goodwill [Line Items]
Intangibles recognized						$ 190,000

Goodwill, Core Deposit Premiu61

Goodwill, Core Deposit Premium and Other Intangible Assets (Carrying amount of intangible assets (incl accumulated amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 111,807	$ 101,652
Accumulated Amortization	48,180	43,099
Net Carrying Amount	63,627	58,553
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	62,008	43,504
Accumulated Amortization	25,271	21,049
Net Carrying Amount	36,737	22,455
Customer relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,177	1,177
Accumulated Amortization	886	857
Net Carrying Amount	291	320
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,903	50,467
Accumulated Amortization	18,161	18,379
Net Carrying Amount	23,742	32,088
Commercial servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,719	6,504
Accumulated Amortization	3,862	2,814
Net Carrying Amount	$ 2,857	$ 3,690

Goodwill, Core Deposit Premiu62

Goodwill, Core Deposit Premium and Other Intangible Assets (Estimated future amortization expense for amortizable intangible assets) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Future amortization expense for amortizable intangible assets [Line Items]
Three months ending December 31, 2017	$ 4,472
Year ending December 31,
2,018	12,771
2,019	11,079
2,020	9,470
2,021	7,880
2,022	6,012
Thereafter	11,943
Total	63,627
Core deposit intangibles
Future amortization expense for amortizable intangible assets [Line Items]
Three months ending December 31, 2017	1,815
Year ending December 31,
2,018	6,712
2,019	5,915
2,020	5,191
2,021	4,425
2,022	3,391
Thereafter	9,288
Total	36,737
Customer relationship intangibles
Future amortization expense for amortizable intangible assets [Line Items]
Three months ending December 31, 2017	10
Year ending December 31,
2,018	39
2,019	38
2,020	37
2,021	35
2,022	34
Thereafter	98
Total	291
Mortgage servicing rights
Future amortization expense for amortizable intangible assets [Line Items]
Three months ending December 31, 2017	2,463
Year ending December 31,
2,018	5,319
2,019	4,560
2,020	3,800
2,021	3,040
2,022	2,280
Thereafter	2,280
Total	23,742
Commercial servicing rights
Future amortization expense for amortizable intangible assets [Line Items]
Three months ending December 31, 2017	184
Year ending December 31,
2,018	701
2,019	566
2,020	442
2,021	380
2,022	307
Thereafter	277
Total	$ 2,857

Goodwill, Core Deposit Premiu63

Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage and commercial loans servicing) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Valuation servicing rights in tranches [Line Items]
Mortgage loans serviced for others	$ 3,560,000,000		$ 3,560,000,000		$ 4,310,000,000
Custodial escrow balances maintained	24,300,000		24,300,000		21,400,000
Total net loans receivable held to maturity	773,900,000
Amount derecognized	6,900,000
Proceeds from sale of mortgage servicing rights	5,100,000		5,137,000	$ 0
Gain (loss) on sale of portfolio			(183,000)
Receivable recorded	1,600,000		1,600,000
Loans serviced	26,599,000		26,599,000		35,778,000
Mortgage Servicing Rights
Valuation servicing rights in tranches [Line Items]
Servicing asset at amortized value	35,000,000	$ 38,127,000	35,000,000	38,127,000	$ 45,200,000
Amount derecognized			$ 6,940,000	0
Prepayment rate			10.93%		9.63%
Discount rate			9.06%		9.26%
Fees collected for servicing of mortgage loans	2,900,000	3,100,000	$ 9,300,000	$ 9,000,000
Mortgage Servicing Rights | Minimum
Valuation servicing rights in tranches [Line Items]
Average cap rate			0.91%	0.88%
Mortgage Servicing Rights | Maximum
Valuation servicing rights in tranches [Line Items]
Average cap rate			1.50%	1.35%
Mortgage Servicing Rights 15-year Tranche
Valuation servicing rights in tranches [Line Items]
Servicing asset, agreement term			15 years
Mortgage Servicing Rights 30-year Tranche
Valuation servicing rights in tranches [Line Items]
Servicing asset, agreement term			30 years
Commercial Servicing Rights
Valuation servicing rights in tranches [Line Items]
Servicing asset at amortized value	3,458,000	4,397,000	$ 3,458,000	$ 4,397,000	$ 4,100,000
Fees collected for servicing of mortgage loans			1,200,000	$ 685,000
Loans serviced	144,400,000		$ 144,400,000		$ 164,600,000
Commercial Servicing Rights | Minimum
Valuation servicing rights in tranches [Line Items]
Prepayment rate			6.66%		6.96%
Discount rate			12.52%		12.44%
Average cap rate			3.10%	3.10%
Commercial Servicing Rights | Maximum
Valuation servicing rights in tranches [Line Items]
Prepayment rate			7.99%		7.88%
Discount rate			14.65%		13.88%
Average cap rate			4.45%	4.45%
Commercial Servicing Rights Less Than 20 Years
Valuation servicing rights in tranches [Line Items]
Servicing asset at amortized value	827,000		$ 827,000		$ 1,200,000
Servicing asset, agreement term			20 years
Fees collected for servicing of mortgage loans	394,000	$ 230,000
Valuation allowance			$ 0		0
Commercial Servicing Rights More Than 20 Years
Valuation servicing rights in tranches [Line Items]
Servicing asset at amortized value	$ 2,631,000		$ 2,631,000		2,927,000
Servicing asset, agreement term			20 years
Valuation allowance			$ 4,000		$ 33,000

Goodwill, Core Deposit Premiu64

Goodwill, Core Deposit Premium and Other Intangible Assets (Changes in capitalized mortgage and commercial servicing rights) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Sale of mortgage servicing rights	$ (6,900)
Valuation allowance on commercial servicing rights	5	$ 5	$ 29	$ (41)
Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period			32,088	30,314
Originations			5,778	9,323
Amortization			(7,184)	(7,795)
Sale of mortgage servicing rights			(6,940)	0
Balance at end of period	23,742	31,842	23,742	31,842
Fair value of servicing rights	35,000	38,127	$ 35,000	$ 38,127	$ 45,200
Commercial servicing rights, net to servicing portfolio			0.67%	0.75%
Commercial servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period			$ 3,690	$ 4,611
Purchased commercial servicing rights			0	190
Originations			215	533
Amortization			(1,077)	(1,229)
Valuation allowance on commercial servicing rights			29	(41)
Balance at end of period	2,857	4,064	2,857	4,064
Fair value of servicing rights	$ 3,458	$ 4,397	$ 3,458	$ 4,397	$ 4,100
Commercial servicing rights, net to servicing portfolio			1.98%	2.38%

Goodwill, Core Deposit Premiu65

Goodwill, Core Deposit Premium and Other Intangible Assets (Book value, fair value of commercial serving rights and impairment) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Less than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	$ 622,000	$ 1,008,000
Fair Value	827,000	1,200,000
Impairment	0	0
More than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	2,239,000	2,715,000
Fair Value	2,631,000	2,927,000
Impairment	4,000	33,000
Citywide Banks | Less than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	12,000	19,000
Fair Value	15,000	23,000
Impairment	0	0
Citywide Banks | More than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	54,000	107,000
Fair Value	61,000	114,000
Impairment	0	0
Premier Valley Bank | Less than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	95,000	156,000
Fair Value	124,000	180,000
Impairment	0	0
Premier Valley Bank | More than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	317,000	359,000
Fair Value	313,000	326,000
Impairment	4,000	33,000
Wisconsin Bank & Trust | Less than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	515,000	833,000
Fair Value	688,000	997,000
Impairment	0	0
Wisconsin Bank & Trust | More than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	1,868,000	2,249,000
Fair Value	2,257,000	2,487,000
Impairment	$ 0	$ 0

Derivative Financial Instrume66

Derivative Financial Instruments (Cash collateral on derivative financial instruments) (Narrative) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Cash pledged as collateral	$ 2,200,000	$ 2,200,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 0	$ 0

Derivative Financial Instrume67

Derivative Financial Instruments (Cash flow hedges) (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)transaction	Mar. 31, 2015USD ($)transaction
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Change in net unrealized losses on cash flow hedges	$ 1
Estimated amount to be reclassified from accumulated other comprehensive income to interest expense within the next twelve months	$ 1.2
Interest Rate Swap | Heartland Financial Statutory Trust VI
Derivative [Line Items]
Number of swap transactions | transaction		2
Derivative, notional amount		$ 20
Interest Rate Swap | Cash Flow Hedges
Derivative [Line Items]
Number of swap transactions | transaction	5
Derivative, notional amount	$ 85
Interest Rate Swap | Cash Flow Hedges | Heartland Financial Statutory Trust IV, V and VII
Derivative [Line Items]
Derivative, notional amount	65
Interest Rate Swap | Cash Flow Hedges | Morrill Statutory Trust I and II
Derivative [Line Items]
Derivative, notional amount	$ 20

Derivative Financial Instrume68

Derivative Financial Instruments (Cash flow hedges) (Balance sheet category and fair values) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other liabilities | Interest Rate Swap due March 17, 2021
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 25,000	$ 25,000
Fair Value, Other Liabilities	$ (346)	$ (447)
Receive Rate	1.321%	0.993%
Weighted Average Pay Rate	2.255%	2.255%
Other liabilities | Interest Rate Swap due March 1, 2017
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 0	$ 20,000
Fair Value, Other Liabilities	$ 0	$ (114)
Receive Rate	0.00%	0.931%
Weighted Average Pay Rate	3.22%	3.22%
Other liabilities | Interest Rate Swap due January 7, 2020
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 20,000	$ 20,000
Fair Value, Other Liabilities	$ (828)	$ (1,145)
Receive Rate	1.303%	0.868%
Weighted Average Pay Rate	3.355%	3.355%
Other liabilities | Interest Rate Swap due March 26, 2019
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 10,000	$ 10,000
Fair Value, Other Liabilities	$ (6)	$ (42)
Receive Rate	1.329%	0.997%
Weighted Average Pay Rate	1.674%	1.674%
Other liabilities | Interest Rate Swap due March 18, 2019
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 10,000	$ 10,000
Fair Value, Other Liabilities	$ (5)	$ (41)
Receive Rate	1.321%	0.993%
Weighted Average Pay Rate	1.658%	1.658%
Other liabilities | Interest Rate Swap due June 15, 2024
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 20,000	$ 20,000
Fair Value, Other Liabilities	$ (393)	$ (214)
Receive Rate	1.32%	0.00%
Weighted Average Pay Rate	2.39%	2.39%
Other liabilities | Interest Rate Swap due March 1, 2024
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	$ 20,000	$ 20,000
Fair Value, Other Liabilities	$ (365)	$ (262)
Receive Rate	1.316%	0.00%
Weighted Average Pay Rate	2.352%	2.352%
Other assets | Interest Rate Swap due May 10, 2021
Derivatives, Fair Value [Line Items]
Notional Amount, Other Assets	$ 35,667	$ 37,667
Fair Value, Other Assets	$ 557	$ 530
Receive Rate	3.735%	3.164%
Weighted Average Pay Rate	3.674%	3.674%

Derivative Financial Instrume69

Derivative Financial Instruments (Cash flow hedges) (Gains (losses) recognized) (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 325	$ 1,336	$ 349	$ (3,160)
Interest expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(308)	(492)	(1,005)	(1,463)
Other income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	$ 0	$ 0	$ 0	$ 0

Derivative Financial Instrume70

Derivative Financial Instruments (Fair value hedges) (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Cash pledged as collateral	$ 2.2	$ 2.2
Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Cash pledged as collateral	$ 4.5	$ 5

Derivative Financial Instrume71

Derivative Financial Instruments (Fair value hedges) (Balance sheet category and fair values) (Details) - Other liabilities - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Feb. 05, 2016
Derivative [Line Items]
Notional Amount			$ 2,000,000
Fair value hedges
Derivative [Line Items]
Notional Amount	$ 35,813,000	$ 40,807,000
Fair Value	$ (1,537,000)	$ (1,626,000)

Derivative Financial Instrume72

Derivative Financial Instruments (Fair value hedges) (Gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair value hedges | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss)	$ (63)	$ (225)	$ 89	$ (2,335)

Derivative Financial Instrume73

Derivative Financial Instruments (Embedded derivatives) (Balance sheet category and fair values) (Details) - Embedded derivatives - Other assets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Amount	$ 14,175	$ 14,549
Fair Value	$ 923	$ 1,104

Derivative Financial Instrume74

Derivative Financial Instruments (Embedded derivatives) (Gain (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other noninterest income | Embedded derivatives
Derivative [Line Items]
Amount of Gain (Loss)	$ (296)	$ (173)	$ (181)	$ 243

Derivative Financial Instrume75

Derivative Financial Instruments (Embedded derivatives) (Narrative) (Details)	Dec. 31, 2016shares	Feb. 05, 2016USD ($)shares	Sep. 30, 2017shares
Derivative [Line Items]
Number of shares to be issued upon conversion (in shares)	20,481	73,394
Number of shares issued upon conversion (in shares)			20,481
Other liabilities
Derivative [Line Items]
Derivative, notional amount | $		$ 2,000,000

Derivative Financial Instrume76

Derivative Financial Instruments (Embedded derivatives) (Embedded conversion options) (Balance sheet category and fair values) (Details) - Other liabilities - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Feb. 05, 2016
Derivative [Line Items]
Notional Amount			$ 2,000,000
Embedded conversion option
Derivative [Line Items]
Notional Amount	$ 0	$ 558,000
Fair Value	$ 0	$ 422,000

Derivative Financial Instrume77

Derivative Financial Instruments (Embedded derivatives) (Embedded conversion options) (Gain (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other noninterest income | Embedded conversion option
Derivative [Line Items]
Amount of Gain (Loss)	$ 285	$ 435	$ 422	$ 138

Derivative Financial Instrume78

Derivative Financial Instruments (Back-to-back loan swaps) (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Cash pledged as collateral	$ 2,200,000		$ 2,200,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	0		0
Back-to-Back Loan Swaps | Interest Rate Swap
Derivative [Line Items]
Cash pledged as collateral	2,000,000		1,800,000
Back-to-Back Loan Swaps | Interest Rate Swap | Interest income
Derivative [Line Items]
Gain (loss) recognized	0	$ 0
Back-to-Back Loan Swaps | Interest Rate Swap | Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 190,000		$ 768,000

Derivative Financial Instrume79

Derivative Financial Instruments (Back-to-back loan swaps) (Balance sheet category and fair values) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Feb. 05, 2016
Other liabilities
Derivative [Line Items]
Notional Amount			$ 2,000,000
Back-to-Back Loan Swaps | Other assets
Derivative [Line Items]
Notional Amount	$ 90,370,000	$ 69,594,000
Fair Value, Receive fixed-pay floating interest rate swap	$ 1,906,000	$ 1,588,000
Weighted Average Receive Rate	4.75%	4.66%
Weighted Average Pay Rate	3.91%	3.47%
Back-to-Back Loan Swaps | Other liabilities
Derivative [Line Items]
Notional Amount	$ 90,370,000	$ 69,594,000
Fair Value, Pay fixed-receive floating interest rate swap	$ (1,906,000)	$ (1,588,000)
Weighted Average Receive Rate	3.91%	3.47%
Weighted Average Pay Rate	4.75%	4.66%

Derivative Financial Instrume80

Derivative Financial Instruments (Other free standing derivatives) (Narrative) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Cash pledged as collateral	$ 2,200,000	$ 2,200,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	0	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Cash pledged as collateral	353,000	0
Not Designated as Hedging Instrument | Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 29,000	$ 2,900,000

Derivative Financial Instrume81

Derivative Financial Instruments (Other free standing derivatives) (Balance sheet category and fair values) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other assets | Interest rate lock commitments (mortgage)
Derivatives, Fair Value [Line Items]
Notional Amount, Other Assets	$ 77,910	$ 80,465
Fair Value, Other Assets	2,463	2,790
Other assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Assets	75,192	142,750
Fair Value, Other Assets	237	2,546
Other liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	91,865	59,276
Fair Value, Other Liabilities	(261)	(266)
Other liabilities | Undesignated interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	14,175	15,564
Fair Value, Other Liabilities	$ (923)	$ (1,126)

Derivative Financial Instrume82

Derivative Financial Instruments (Other free standing derivatives) (Gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net gains on sale of loans held for sale | Interest rate lock commitments (mortgage)
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ (1,245)	$ (1,344)	$ (587)	$ 4,464
Net gains on sale of loans held for sale | Forward commitments
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	72	931	(2,304)	(1,311)
Other noninterest income | Undesignated interest rate swaps
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ 88	$ 269	$ 203	$ (101)

Fair Value (Fair value measurem

Fair Value (Fair value measurement recurring) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Securities available for sale	$ 2,093,385	$ 1,845,864
Level 1
Assets
Securities available for sale	3,505	517
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Level 2
Assets
Securities available for sale	2,089,880	1,843,123
Derivative assets	3,386	3,222
Liabilities
Derivative liabilities	6,309	7,027
Level 3
Assets
Securities available for sale	0	2,224
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Interest rate lock commitments | Level 1
Assets
Derivative assets	0	0
Interest rate lock commitments | Level 2
Assets
Derivative assets	0	0
Interest rate lock commitments | Level 3
Assets
Derivative assets	2,463	2,790
Forward commitments | Level 1
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Forward commitments | Level 2
Assets
Derivative assets	237	2,546
Liabilities
Derivative liabilities	261	266
Forward commitments | Level 3
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
U.S. government corporations and agencies
Assets
Securities available for sale	7,415	4,700
Mortgage-backed securities
Assets
Securities available for sale	1,565,400	1,290,500
Obligations of states and political subdivisions
Assets
Securities available for sale	503,974	536,144
Equity securities
Assets
Securities available for sale	16,596	14,520
Recurring Basis
Assets
Total assets at fair value	2,099,471	1,854,422
Liabilities
Total liabilities at fair value	6,570	7,293
Recurring Basis | Level 1
Assets
Total assets at fair value	3,505	517
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Level 2
Assets
Total assets at fair value	2,093,503	1,848,891
Liabilities
Total liabilities at fair value	6,570	7,293
Recurring Basis | Level 3
Assets
Total assets at fair value	2,463	5,014
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Derivative Financial Instruments
Assets
Derivative assets	3,386	3,222
Liabilities
Derivative liabilities	6,309	7,027
Recurring Basis | Derivative Financial Instruments | Level 1
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Derivative Financial Instruments | Level 2
Assets
Derivative assets	3,386	3,222
Liabilities
Derivative liabilities	6,309	7,027
Recurring Basis | Derivative Financial Instruments | Level 3
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Interest rate lock commitments
Assets
Derivative assets	2,463	2,790
Recurring Basis | Interest rate lock commitments | Level 1
Assets
Derivative assets	0	0
Recurring Basis | Interest rate lock commitments | Level 2
Assets
Derivative assets	0	0
Recurring Basis | Interest rate lock commitments | Level 3
Assets
Derivative assets	2,463	2,790
Recurring Basis | Forward commitments
Assets
Derivative assets	237	2,546
Liabilities
Derivative liabilities	261	266
Recurring Basis | Forward commitments | Level 1
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Forward commitments | Level 2
Assets
Derivative assets	237	2,546
Liabilities
Derivative liabilities	261	266
Recurring Basis | Forward commitments | Level 3
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | U.S. government corporations and agencies
Assets
Securities available for sale	7,415	4,700
Recurring Basis | U.S. government corporations and agencies | Level 1
Assets
Securities available for sale	3,505	517
Recurring Basis | U.S. government corporations and agencies | Level 2
Assets
Securities available for sale	3,910	4,183
Recurring Basis | U.S. government corporations and agencies | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities
Assets
Securities available for sale	1,565,400	1,290,500
Recurring Basis | Mortgage-backed securities | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities | Level 2
Assets
Securities available for sale	1,565,400	1,288,276
Recurring Basis | Mortgage-backed securities | Level 3
Assets
Securities available for sale	0	2,224
Recurring Basis | Obligations of states and political subdivisions
Assets
Securities available for sale	503,974	536,144
Recurring Basis | Obligations of states and political subdivisions | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions | Level 2
Assets
Securities available for sale	503,974	536,144
Recurring Basis | Obligations of states and political subdivisions | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Corporate debt securities
Assets
Securities available for sale	0
Recurring Basis | Corporate debt securities | Level 1
Assets
Securities available for sale	0
Recurring Basis | Corporate debt securities | Level 2
Assets
Securities available for sale	0
Recurring Basis | Corporate debt securities | Level 3
Assets
Securities available for sale	0
Recurring Basis | Equity securities
Assets
Securities available for sale	16,596	14,520
Recurring Basis | Equity securities | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Equity securities | Level 2
Assets
Securities available for sale	16,596	14,520
Recurring Basis | Equity securities | Level 3
Assets
Securities available for sale	$ 0	$ 0

Fair Value (Fair value measur84

Fair Value (Fair value measurement non-recurring) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 13,226	$ 9,744
Premises, furniture and equipment held for sale	4,428	414
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	13,226	9,744
Commercial servicing rights | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	313	326
Premises, furniture and equipment held for sale | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	4,428	414
Commercial | Commercial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	3,556	1,683
Commercial | Commercial real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	8,718	3,026
Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	7,936	1,955
Residential real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,365	3,565
Consumer | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	912	1,193
Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	22,487	11,422
Other real estate owned	13,226	9,744
Nonrecurring Basis | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	3,162	653
Other real estate owned	594	1,341
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Other real estate owned	0	0
Nonrecurring Basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Other real estate owned	0	0
Nonrecurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	22,487	11,422
Other real estate owned	13,226	9,744
Nonrecurring Basis | Commercial servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	313	326
Nonrecurring Basis | Commercial servicing rights | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	(29)	33
Nonrecurring Basis | Commercial servicing rights | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	0	0
Nonrecurring Basis | Commercial servicing rights | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	0	0
Nonrecurring Basis | Commercial servicing rights | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial servicing rights	313	326
Nonrecurring Basis | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	4,428	414
Nonrecurring Basis | Premises, furniture and equipment held for sale | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	404	35
Nonrecurring Basis | Premises, furniture and equipment held for sale | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	0	0
Nonrecurring Basis | Premises, furniture and equipment held for sale | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	0	0
Nonrecurring Basis | Premises, furniture and equipment held for sale | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	4,428	414
Nonrecurring Basis | Commercial | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	3,556	1,683
Nonrecurring Basis | Commercial | Commercial | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,119	41
Nonrecurring Basis | Commercial | Commercial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Commercial | Commercial | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Commercial | Commercial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	3,556	1,683
Nonrecurring Basis | Commercial | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	8,718	3,026
Nonrecurring Basis | Commercial | Commercial real estate | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	2,043	527
Nonrecurring Basis | Commercial | Commercial real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Commercial | Commercial real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Commercial | Commercial real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	8,718	3,026
Nonrecurring Basis | Agricultural and agricultural real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	7,936	1,955
Nonrecurring Basis | Agricultural and agricultural real estate | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Agricultural and agricultural real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Agricultural and agricultural real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	7,936	1,955
Nonrecurring Basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,365	3,565
Nonrecurring Basis | Residential real estate | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	85
Nonrecurring Basis | Residential real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Residential real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Residential real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,365	3,565
Nonrecurring Basis | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	912	1,193
Nonrecurring Basis | Consumer | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Consumer | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Nonrecurring Basis | Consumer | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 912	$ 1,193

Fair Value (Quantitative Inform

Fair Value (Quantitative Information about Level 3 fair value measurements) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Securities available for sale	$ 2,093,385	$ 1,845,864
Premises, furniture and equipment held for sale	4,428	414
Other real estate owned	$ 13,226	$ 9,744
Commercial servicing rights | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	12.52%	12.44%
Commercial servicing rights | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	14.65%	13.88%
Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Securities available for sale	$ 0	$ 2,224
Derivative assets	0	0
Other real estate owned	$ 13,226	$ 9,744
Level 3 | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	10.00%	10.00%
Level 3 | Commercial | Commercial
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 3,556	$ 1,683
Level 3 | Commercial | Commercial | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Commercial | Commercial | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	15.00%	8.00%
Level 3 | Commercial | Commercial real estate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 8,718	$ 3,026
Level 3 | Commercial | Commercial real estate | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Commercial | Commercial real estate | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	14.00%	7.00%
Level 3 | Agricultural and agricultural real estate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 7,936	$ 1,955
Level 3 | Agricultural and agricultural real estate | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Agricultural and agricultural real estate | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	6.00%	10.00%
Level 3 | Residential real estate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 1,365	$ 3,565
Level 3 | Residential real estate | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Residential real estate | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	13.00%	8.00%
Level 3 | Consumer
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 912	$ 1,193
Level 3 | Consumer | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Consumer | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	11.00%	11.00%
Level 3 | Commercial servicing rights
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Commercial servicing rights	$ 313	$ 326
Level 3 | Premises, furniture and equipment held for sale
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	$ 4,428	$ 414
Level 3 | Premises, furniture and equipment held for sale | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	0.00%	0.00%
Level 3 | Premises, furniture and equipment held for sale | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate	10.00%	8.00%
Level 3 | Interest rate lock commitments
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Derivative assets	$ 2,463	$ 2,790
Level 3 | Interest rate lock commitments | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Closing ratio	0.00%	0.00%
Level 3 | Interest rate lock commitments | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Closing ratio	99.00%	99.00%
Level 3 | Interest rate lock commitments | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Closing ratio	89.00%	89.00%
Level 3 | Z-TRANCHE Securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Securities available for sale	$ 0	$ 2,224
Level 3 | Z-TRANCHE Securities | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate		7.50%
Actual defaults (as a percent)		21.77%
Actual deferrals (as a percent)		10.44%
Level 3 | Z-TRANCHE Securities | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pretax discount rate		9.50%
Actual defaults (as a percent)		37.62%
Actual deferrals (as a percent)		26.29%
Level 3 | Z-TRANCHE Securities | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Actual defaults (as a percent)		33.11%
Actual deferrals (as a percent)		14.81%

Fair Value (Changes Level 3 ass

Fair Value (Changes Level 3 assets (fair value, recurring)) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Purchases, acquired, sales and settlements:
Gains included in net gains on sale of loans held for sale	$ 11,968	$ 23,938
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,790	3,168	$ 3,168
Total gains (losses):
Included in earnings	(587)		(1,564)
Issuances	1,580		5,373
Purchases, acquired, sales and settlements:
Settlements	(1,320)		(4,187)
Balance at period end	2,463		2,790
Gains included in net gains on sale of loans held for sale	2,500		2,800
Z-TRANCHE Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,224	$ 2,039	2,039
Total gains (losses):
Included in earnings	2,810		0
Included in other comprehensive income	(2,166)		185
Purchases, acquired, sales and settlements:
Purchases	0		0
Sales	(2,868)		0
Settlements	0		0
Balance at period end	$ 0		$ 2,224

Fair Value (Estimated fair valu

Fair Value (Estimated fair value financial instruments (incl. carrying amounts)) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities:
Securities available for sale	$ 2,093,385	$ 1,845,864
Held to maturity	270,386	274,799
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	251,736	158,724
Securities:
Securities available for sale	3,505	517
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	0	0
Derivative assets	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Securities:
Securities available for sale	2,089,880	1,843,123
Held to maturity	270,386	274,799
Other investments	22,981	21,365
Loans held for sale	35,795	61,261
Loans, net	6,271,749	5,259,690
Derivative assets	3,386	3,222
Financial liabilities:
Short term borrowings	171,871	306,459
Other borrowings	305,741	288,534
Derivative liabilities	6,309	7,027
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Securities:
Securities available for sale	0	2,224
Held to maturity	0	0
Other investments	195	195
Loans held for sale	0	0
Loans, net	22,487	11,422
Derivative assets	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivative liabilities	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	251,736	158,724
Securities:
Securities available for sale	2,093,385	1,845,864
Held to maturity	256,355	263,662
Other investments	23,176	21,560
Loans held for sale	35,795	61,261
Loans, net	6,320,121	5,297,395
Derivative assets	3,386	3,222
Financial liabilities:
Short term borrowings	171,871	306,459
Other borrowings	301,473	288,534
Derivative liabilities	6,309	7,027
Estimated Fair Value
Financial assets:
Cash and cash equivalents	251,736	158,724
Securities:
Securities available for sale	2,093,385	1,845,864
Held to maturity	270,386	274,799
Other investments	23,176	21,560
Loans held for sale	35,795	61,261
Loans, net	6,294,236	5,271,112
Derivative assets	3,386	3,222
Financial liabilities:
Short term borrowings	171,871	306,459
Other borrowings	305,741	288,534
Derivative liabilities	6,309	7,027
Interest rate lock commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Derivative assets	0	0
Interest rate lock commitments | Significant Other Observable Inputs (Level 2)
Securities:
Derivative assets	0	0
Interest rate lock commitments | Significant Unobservable Inputs (Level 3)
Securities:
Derivative assets	2,463	2,790
Interest rate lock commitments | Carrying Amount
Securities:
Derivative assets	2,463	2,790
Interest rate lock commitments | Estimated Fair Value
Securities:
Derivative assets	2,463	2,790
Forward commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0	0
Forward commitments | Significant Other Observable Inputs (Level 2)
Securities:
Derivative assets	237	2,546
Financial liabilities:
Derivative liabilities	261	266
Forward commitments | Significant Unobservable Inputs (Level 3)
Securities:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0	0
Forward commitments | Carrying Amount
Securities:
Derivative assets	237	2,546
Financial liabilities:
Derivative liabilities	261	266
Forward commitments | Estimated Fair Value
Securities:
Derivative assets	237	2,546
Financial liabilities:
Derivative liabilities	261	266
Commercial | Commercial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Commercial | Commercial | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	1,597,795	1,257,071
Commercial | Commercial | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	3,556	1,683
Commercial | Commercial | Carrying Amount
Securities:
Loans, net	1,596,934	1,272,089
Commercial | Commercial | Estimated Fair Value
Securities:
Loans, net	1,601,351	1,258,754
Commercial | Commercial real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Commercial | Commercial real estate | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	3,109,111	2,503,832
Commercial | Commercial real estate | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	8,718	3,026
Commercial | Commercial real estate | Carrying Amount
Securities:
Loans, net	3,143,414	2,513,446
Commercial | Commercial real estate | Estimated Fair Value
Securities:
Loans, net	3,117,829	2,506,858
Agricultural and agricultural real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Agricultural and agricultural real estate | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	500,038	485,046
Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	7,936	1,955
Agricultural and agricultural real estate | Carrying Amount
Securities:
Loans, net	506,388	485,820
Agricultural and agricultural real estate | Estimated Fair Value
Securities:
Loans, net	507,974	487,001
Residential real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Residential real estate | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	621,333	600,668
Residential real estate | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	1,365	3,565
Residential real estate | Carrying Amount
Securities:
Loans, net	632,306	614,207
Residential real estate | Estimated Fair Value
Securities:
Loans, net	622,698	604,233
Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Consumer | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	443,472	413,073
Consumer | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	912	1,193
Consumer | Carrying Amount
Securities:
Loans, net	441,079	411,833
Consumer | Estimated Fair Value
Securities:
Loans, net	444,384	414,266
Time deposits in other financial institutions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Time deposits in other financial institutions	19,793	2,105
Time deposits in other financial institutions | Significant Other Observable Inputs (Level 2)
Financial assets:
Time deposits in other financial institutions	0	0
Time deposits in other financial institutions | Significant Unobservable Inputs (Level 3)
Financial assets:
Time deposits in other financial institutions	0	0
Time deposits in other financial institutions | Carrying Amount
Financial assets:
Time deposits in other financial institutions	19,793	2,105
Time deposits in other financial institutions | Estimated Fair Value
Financial assets:
Time deposits in other financial institutions	19,793	2,105
Demand deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities:
Deposits	0	0
Demand deposits | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Deposits	3,009,940	2,202,036
Demand deposits | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Deposits	0	0
Demand deposits | Carrying Amount
Financial liabilities:
Deposits	3,009,940	2,202,036
Demand deposits | Estimated Fair Value
Financial liabilities:
Deposits	3,009,940	2,202,036
Savings deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities:
Deposits	0	0
Savings deposits | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Deposits	4,227,340	3,788,089
Savings deposits | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Deposits	0	0
Savings deposits | Carrying Amount
Financial liabilities:
Deposits	4,227,340	3,788,089
Savings deposits | Estimated Fair Value
Financial liabilities:
Deposits	4,227,340	3,788,089
Time deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities:
Deposits	0	0
Time deposits | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Deposits	994,604	857,286
Time deposits | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Deposits	0	0
Time deposits | Carrying Amount
Financial liabilities:
Deposits	994,604	857,286
Time deposits | Estimated Fair Value
Financial liabilities:
Deposits	$ 994,604	$ 857,286

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)segment	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting [Abstract]
Number of operating segments (segment) | segment			2
Segment Reporting Information [Line Items]
Net interest income	$ 89,844	$ 73,681	$ 237,452	$ 219,506
Provision for loan losses	5,705	5,328	10,235	9,513
Total noninterest income	24,977	28,542	76,494	89,146
Total noninterest expense	78,759	68,427	219,797	209,756
INCOME BEFORE INCOME TAXES	30,357	28,468	83,914	89,383
Average Loans, for the period	6,286,284	5,538,088	5,679,620	5,493,187
Segment Assets, at period end	9,755,627	8,202,215	9,755,627	8,202,215	$ 8,247,079
Community and Other Banking
Segment Reporting Information [Line Items]
Net interest income	88,778	72,694	234,406	216,172
Provision for loan losses	5,705	5,328	10,235	9,513
Total noninterest income	19,680	17,337	56,964	55,773
Total noninterest expense	69,977	57,988	193,753	177,421
INCOME BEFORE INCOME TAXES	32,776	26,715	87,382	85,011
Average Loans, for the period	6,245,445	5,464,304	5,641,641	5,422,843
Segment Assets, at period end	9,693,172	8,084,810	9,693,172	8,084,810
Retail Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income	1,066	987	3,046	3,334
Provision for loan losses	0	0	0	0
Total noninterest income	5,297	11,205	19,530	33,373
Total noninterest expense	8,782	10,439	26,044	32,335
INCOME BEFORE INCOME TAXES	(2,419)	1,753	(3,468)	4,372
Average Loans, for the period	40,839	73,784	37,979	70,344
Segment Assets, at period end	$ 62,455	$ 117,405	$ 62,455	$ 117,405