Nicolet Bankshares (NIC) 10-Q 31 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 30, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	NICOLET BANKSHARES INC
Entity Central Index Key	0001174850
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		9,366,490
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Emerging Growth Company	false
Entity Small Business Company	false
Entity Shell Company	false
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019		Dec. 31, 2018
Assets
Cash and due from banks	$ 88,371		$ 85,896
Interest-earning deposits	55,598		163,630
Cash and cash equivalents	143,969	[1]	249,526
Certificates of deposit in other banks	5,395		993
Securities available for sale (“AFS”), at fair value	419,300		400,144
Other investments	20,697		17,997
Loans held for sale	10,564		1,639
Loans	2,242,931		2,166,181
Allowance for loan losses (ALLL)	(13,620)		(13,153)
Loans, net	2,229,311		2,153,028
Premises and equipment, net	47,680		48,173
Bank owned life insurance (“BOLI”)	71,796		66,310
Goodwill and other intangibles, net	121,371		124,307
Accrued interest receivable and other assets	35,588		34,418
Total assets	3,105,671		3,096,535
Deposits
Noninterest-bearing demand deposits	782,968		753,065
Interest-bearing deposits	1,801,479		1,861,073
Total deposits	2,584,447		2,614,138
Long-term borrowings	57,495		77,305
Accrued interest payable and other liabilities	34,987		17,740
Total liabilities	2,676,929		2,709,183
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	94		95
Additional paid-in capital	236,534		247,790
Retained earnings	186,710		144,364
Accumulated other comprehensive income (loss)	4,676		(5,640)
Total Nicolet Bankshares, Inc. stockholders’ equity	428,014		386,609
Noncontrolling interest	728		743
Total stockholders’ equity and noncontrolling interest	428,742		387,352
Total liabilities, noncontrolling interest and stockholders’ equity	$ 3,105,671		$ 3,096,535
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred shares authorized (no par value) (in shares)	10,000,000		10,000,000
Preferred shares issued and outstanding (in shares)	0		0
Common shares authorized (par value $0.01 per share) (in shares)	30,000,000		30,000,000
Common shares outstanding (in shares)	9,363,407		9,495,265
Common shares issued (in shares)	9,387,096		9,524,777
[1]	* Cash and cash equivalents include restricted cash of $6.3 million and $7.4 million at September 30, 2019 and 2018, respectively, for the reserve balance required with the Federal Reserve Bank. At September 30, 2019, cash and cash equivalents also includes restricted cash of $1.3 million pledged as collateral on interest rate swaps.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred shares, no par value (in dollars per share)	$ 0	$ 0
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Loans, including loan fees	$ 31,334	$ 28,997	$ 92,511	$ 84,644
Investment securities:
Taxable	1,904	1,564	5,578	4,503
Tax-exempt	503	572	1,574	1,737
Other interest income	926	747	2,733	2,326
Total interest income	34,667	31,880	102,396	93,210
Interest expense:
Deposits	4,596	4,055	14,103	11,012
Short-term borrowings	0	0	0	8
Long-term borrowings	881	883	2,684	2,571
Total interest expense	5,477	4,938	16,787	13,591
Net interest income	29,190	26,942	85,609	79,619
Provision for loan losses	400	340	900	1,360
Net interest income after provision for loan losses	28,790	26,602	84,709	78,259
Noninterest income:
Mortgage income, net	3,700	1,902	6,962	4,510
BOLI income	495	1,019	1,834	1,929
Asset gains (losses), net	286	146	8,030	1,322
Other income	1,166	1,484	4,274	4,243
Total noninterest income	12,312	10,649	40,058	29,712
Noninterest expense:
Personnel	12,914	12,983	40,809	38,149
Occupancy, equipment and office	3,454	3,660	10,961	10,901
Business development and marketing	1,428	1,334	4,288	4,139
Data processing	2,515	2,375	7,220	7,094
Intangibles amortization	914	1,054	2,936	3,336
Other expense	1,662	1,638	5,159	4,518
Total noninterest expense	22,887	23,044	71,373	68,137
Income before income tax expense	18,215	14,207	53,394	39,834
Income tax expense	4,603	3,268	10,788	9,431
Net income	13,612	10,939	42,606	30,403
Less: Net income attributable to noncontrolling interest	82	80	260	230
Net income attributable to Nicolet Bankshares, Inc.	$ 13,530	$ 10,859	$ 42,346	$ 30,173
Earnings per common share:
Basic (in dollars per share)	$ 1.45	$ 1.13	$ 4.51	$ 3.12
Diluted (in dollars per share)	$ 1.40	$ 1.09	$ 4.36	$ 3.02
Weighted average common shares outstanding:
Basic (in shares)	9,346,814	9,633,158	9,393,795	9,678,726
Diluted (in shares)	9,696,850	9,949,295	9,706,795	10,004,316
Trust services fee income
Noninterest income:
Fees and commissions	$ 1,594	$ 1,638	$ 4,631	$ 4,915
Brokerage fee income
Noninterest income:
Fees and commissions	2,113	1,732	5,925	5,074
Service charges on deposit accounts
Noninterest income:
Fees and commissions	1,223	1,247	3,587	3,637
Card interchange income
Noninterest income:
Fees and commissions	$ 1,735	$ 1,481	$ 4,815	$ 4,082

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 13,612	$ 10,939	$ 42,606	$ 30,403
Unrealized gains (losses) on securities AFS:
Net unrealized holding gains (losses)	2,053	(1,836)	14,165	(6,814)
Net realized (gains) losses included in income	0	0	(32)	0
Income tax (expense) benefit	(555)	497	(3,817)	1,840
Total other comprehensive income (loss)	1,498	(1,339)	10,316	(4,974)
Comprehensive income	$ 15,110	$ 9,600	$ 52,922	$ 25,429

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interest
Beginning Balance at Dec. 31, 2017	$ 364,879	$ 98	$ 263,835	$ 102,391	$ (2,146)	$ 701
Comprehensive income:
Net income	30,403			30,173		230
Other comprehensive income (loss)	(4,974)				(4,974)
Stock-based compensation expense	3,613		3,613
Exercise of stock options, net	1,224	1	1,223
Issuance of common stock	167		167
Purchase and retirement of common stock	(17,210)	(3)	(17,207)
Distribution to noncontrolling interest	(199)					(199)
Ending Balance at Sep. 30, 2018	377,903	96	251,631	133,501	(8,057)	732
Beginning Balance at Jun. 30, 2018	371,285	96	254,564	122,642	(6,718)	701
Comprehensive income:
Net income	10,939			10,859		80
Other comprehensive income (loss)	(1,339)				(1,339)
Stock-based compensation expense	1,299		1,299
Exercise of stock options, net	262	1	261
Issuance of common stock	59		59
Purchase and retirement of common stock	(4,553)	(1)	(4,552)
Distribution to noncontrolling interest	(49)					(49)
Ending Balance at Sep. 30, 2018	377,903	96	251,631	133,501	(8,057)	732
Comprehensive income:
Cumulative Effect of New Accounting Principle in Period of Adoption				937
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01					(937)
Beginning Balance at Dec. 31, 2018	387,352	95	247,790	144,364	(5,640)	743
Comprehensive income:
Net income	42,606			42,346		260
Other comprehensive income (loss)	10,316				10,316
Stock-based compensation expense	3,643		3,643
Exercise of stock options, net	4,382	2	4,380
Issuance of common stock	449		449
Purchase and retirement of common stock	(19,731)	(3)	(19,728)
Distribution to noncontrolling interest	(275)					(275)
Ending Balance at Sep. 30, 2019	428,742	94	236,534	186,710	4,676	728
Beginning Balance at Jun. 30, 2019	412,148	94	234,963	173,180	3,178	733
Comprehensive income:
Net income	13,612			13,530		82
Other comprehensive income (loss)	1,498				1,498
Stock-based compensation expense	1,144		1,144
Exercise of stock options, net	1,200		1,200
Issuance of common stock	166		166
Purchase and retirement of common stock	(939)	0	(939)
Distribution to noncontrolling interest	(87)					(87)
Ending Balance at Sep. 30, 2019	$ 428,742	$ 94	$ 236,534	$ 186,710	$ 4,676	$ 728

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities:
Net income		$ 42,606	$ 30,403
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion		5,260	4,643
Provision for loan losses		900	1,360
Increase in cash surrender value of life insurance		(1,432)	(1,367)
Stock-based compensation expense		3,643	3,613
Asset (gains) losses, net		(8,030)	(1,322)
Gain on sale of loans held for sale, net		(7,042)	(4,026)
Proceeds from sale of loans held for sale		255,775	184,314
Origination of loans held for sale		(259,465)	(178,911)
Net change in:
Accrued interest receivable and other assets		(5,020)	(4,952)
Accrued interest payable and other liabilities		9,310	6,798
Net cash provided by (used in) operating activities		36,505	40,553
Cash Flows From Investing Activities:
Net (increase) decrease in loans		(74,131)	(50,703)
Net (increase) decrease in certificates of deposit in other banks		(4,402)	751
Purchases of securities AFS		(57,875)	(57,891)
Proceeds from sales of securities AFS		13,240	0
Proceeds from calls and maturities of securities AFS		38,128	40,302
Purchases of other investments		(1,941)	(634)
Proceeds from sales of other investments		17,144	807
Purchases of BOLI		(5,000)	0
Proceeds from redemption of BOLI		1,348	561
Net (increase) decrease in premises and equipment		(3,529)	(2,974)
Net (increase) decrease in other real estate and other assets		15	1,486
Net cash provided by (used in) investing activities		(77,003)	(68,295)
Cash Flows From Financing Activities:
Net increase (decrease) in deposits		(29,691)	51,171
Repayments of long-term borrowings		(20,193)	(1,189)
Purchase and retirement of common stock		(19,731)	(17,210)
Proceeds from issuance of common stock		449	167
Proceeds from exercise of stock options		4,382	1,224
Distribution to noncontrolling interest		(275)	(199)
Net cash provided by (used in) financing activities		(65,059)	33,964
Net increase (decrease) in cash and cash equivalents		(105,557)	6,222
Cash and cash equivalents:
Beginning		249,526	154,933
Ending	[1]	143,969	161,155
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest		16,682	13,294
Cash paid for taxes		11,690	9,325
Transfer of loans and bank premises to other real estate owned		1,025	587
Capitalized mortgage servicing rights		1,807	$ 696
Initial recognition of operating lease right of use asset		$ 5,403
[1]	* Cash and cash equivalents include restricted cash of $6.3 million and $7.4 million at September 30, 2019 and 2018, respectively, for the reserve balance required with the Federal Reserve Bank. At September 30, 2019, cash and cash equivalents also includes restricted cash of $1.3 million pledged as collateral on interest rate swaps.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Statement of Cash Flows [Abstract]
Restricted cash and cash equivalents	$ 6.3	$ 7.4
Restricted cash pledged as collateral on interest rate swaps	$ 1.3

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation General In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the consolidated balance sheets, statements of income, comprehensive income, changes in stockholders’ equity and cash flows of Nicolet Bankshares, Inc. (the “Company” or “Nicolet”) and its subsidiaries, for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions and balances have been eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year. These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted or abbreviated. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Critical Accounting Policies and Estimates Preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future. Estimates are used in accounting for, among other items, the allowance for loan losses, valuation of loans in acquisition transactions, useful lives for depreciation and amortization, fair value of financial instruments, other-than-temporary impairment calculations, valuation of deferred tax assets, uncertain income tax positions and contingencies. Estimates that are particularly susceptible to significant change for the Company include the determination of the allowance for loan losses, the determination and assessment of deferred tax assets and liabilities, and the valuation of loans acquired in acquisition transactions; therefore, these are critical accounting policies. Factors that may cause sensitivity to the aforementioned estimates include but are not limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, changes in applicable banking or tax regulations, and changes to deferred tax estimates. Actual results may ultimately differ from estimates, although management does not generally believe such differences would materially affect the consolidated financial statements in any individual reporting period presented. There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Recent Accounting Developments Adopted In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . ASU 2017-12 expands the activities that qualify for hedge accounting and simplifies the rules for reporting hedging transactions. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company adopted the updated guidance effective January 1, 2019 with no material impact on its consolidated financial statements, because the Company does not have any significant derivatives and does not currently apply hedge accounting to derivatives. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , with several subsequent updates. Topic 842 introduced a new accounting model for lessors and lessees. For lessees, almost all leases are now recognized on the balance sheet as a right-of-use ("ROU") asset and lease liability, unlike previous GAAP which required only capital leases to be recognized on the balance sheet. The accounting applied by lessors is largely unchanged from existing guidance. Topic 842 also requires additional disclosures concerning the amount, timing and uncertainty of cash flows arising from leases. The updated guidance is effective for annual reporting periods beginning after December 15, 2018, and provides a modified retrospective transition approach that allows lessees to recognize and measure leases on the balance sheet at the beginning of either the earliest period presented or as of the beginning of the period of adoption (the "effective date" method), with the option to elect certain practical expedients. Nicolet adopted the new guidance prospectively as of January 1, 2019, using the effective date method; thus, prior comparative periods have not been restated. Upon adoption, Nicolet recognized an ROU asset and lease liability of approximately $5 million . There was no impact to its consolidated statements of income or cash flows compared to the prior lease accounting model. The ROU asset and lease liability are recorded in other assets and other liabilities, respectively, in the consolidated balance sheets. As part of the adoption, Nicolet elected the package of practical expedients permitted under the transition guidance of the new standard which allowed the carry forward of the historical lease classification. Nicolet also elected the practical expedient to group lease and non-lease components as a single lease component; thus, the Company's leases include both lease (e.g., fixed payments including rent, taxes, and insurance costs) and non-lease components (e.g., common area or other maintenance costs). See Note 10 for the new disclosures required by Topic 842. Reclassifications Certain amounts in the 2018 consolidated financial statements have been reclassified to conform to the 2019 presentation.

Pending Acquisition

Pending Acquisition	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Pending Acquisition	Pending Acquisition Nicolet entered into an Agreement and Plan of Merger with Choice Bancorp, Inc. ("Choice" (OTC Pink "CBKW")) on June 26, 2019 (the "Merger Agreement"), pursuant to which Choice will merge with and into Nicolet (the "Merger") to create the largest community bank in the Oshkosh, Wisconsin marketplace. Immediately following the Merger, Choice Bank, the wholly owned bank subsidiary of Choice, will merge with and into Nicolet's wholly owned bank subsidiary (the "Bank Merger"), with Nicolet National Bank as the surviving entity in the Bank Merger. The transaction will involve stock-for-stock consideration at a fixed exchange ratio, subject to cap and collar provisions provided for in the Merger Agreement. At September 30, 2019, Choice had total assets of $436 million , loans of $352 million , deposits of $306 million , and equity of $41 million . Choice assets represented approximately 14% of Nicolet assets at September 30, 2019. As of September 17, 2019, Nicolet received all regulatory approvals for the Merger and Bank Merger, and Choice shareholders approved the Merger on October 22, 2019. The merger is expected to close on November 8, 2019, pending satisfaction of customary closing conditions.

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share Basic earnings per common share are calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common share are calculated by dividing net income available to common shareholders by the weighted average number of shares adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock), if any. Presented below are the calculations for basic and diluted earnings per common share. Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share data) 2019 2018 2019 2018 Net income attributable to Nicolet Bankshares, Inc. $ 13,530 $ 10,859 $ 42,346 $ 30,173 Weighted average common shares outstanding 9,347 9,633 9,394 9,679 Effect of dilutive common stock awards 350 316 313 325 Diluted weighted average common shares outstanding 9,697 9,949 9,707 10,004 Basic earnings per common share* $ 1.45 $ 1.13 $ 4.51 $ 3.12 Diluted earnings per common share* $ 1.40 $ 1.09 $ 4.36 $ 3.02 *Cumulative quarterly per share performance may not equal annual per share totals due to the effects of the amount and timing of capital increases. When computing earnings per share for an interim period, the denominator is based on the weighted average shares outstanding during the interim period, and not on an annualized weighted average basis. Accordingly, the sum of the earnings per share data for the quarters will not necessarily equal the year to date earnings per share data. For the three and nine months ended September 30, 2019 , options to purchase less than 0.1 million shares are excluded from the calculation of diluted earnings per common share as the effect of their exercise would have been anti-dilutive. For the three and nine months ended September 30, 2018 , options to purchase approximately 0.1 million shares are excluded from the calculation of diluted earnings per common share as the effect of their exercise would have been anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company may grant stock options and restricted stock under its stock-based compensation plans to certain officers, employees and directors. These plans are administered by a committee of the Board of Directors. In February 2019, with subsequent shareholder approval, the 2011 Long-Term Incentive Plan was amended to increase the shares reserved for potential stock-based awards from 1,500,000 shares to 3,000,000 shares. At September 30, 2019 , approximately 1.6 million shares were available for grant under these stock-based compensation plans. A Black-Scholes model is utilized to estimate the fair value of stock option grants, while the market price of the Company’s stock at the date of grant is used to estimate the fair value of restricted stock awards. The weighted average assumptions used in the Black-Scholes model for valuing stock option grants were as follows. Nine Months Ended September 30, 2019 2018 Dividend yield — % — % Expected volatility 25 % 25 % Risk-free interest rate 2.37 % 2.48 % Expected average life 7 years 7 years Weighted average per share fair value of options $ 19.23 $ 17.60 A summary of the Company’s stock option activity is summarized below. Stock Options Option Shares Outstanding Weighted Average Exercise Price Weighted Average Remaining Life (Years) Aggregate Intrinsic Value (in thousands) Outstanding - December 31, 2018 1,581,699 $ 40.77 Granted 15,000 59.55 Exercise of stock options * (185,328 ) 23.64 Forfeited (3,538 ) 27.43 Outstanding - September 30, 2019 1,407,833 $ 43.25 7.0 $ 32,829 Exercisable - September 30, 2019 644,033 $ 39.28 6.5 $ 17,577 * The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the nine months ended September 30, 2019 , 70,068 such shares were surrendered to the Company. Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock options. The intrinsic value of options exercised for the nine months ended September 30, 2019 and 2018 was approximately $6.9 million and $1.8 million , respectively. A summary of the Company’s restricted stock activity is summarized below. Restricted Stock Weighted Average Grant Date Fair Value Restricted Shares Outstanding Outstanding - December 31, 2018 $ 39.37 29,512 Granted 61.96 4,257 Vested * 45.05 (9,672 ) Forfeited 16.50 (408 ) Outstanding - September 30, 2019 $ 41.50 23,689 * The terms of the restricted stock agreements permit the surrender of shares to the Company upon vesting in order to satisfy applicable tax withholding requirements at the minimum statutory withholding rate, and accordingly, 1,637 shares were surrendered during the nine months ended September 30, 2019 . The Company recognized approximately $3.4 million of stock-based compensation expense (included in personnel on the consolidated statements of income) for both the nine months ended September 30, 2019 and 2018 , associated with its common stock awards granted to officers and employees. In addition, during 2019 the Company recognized approximately $0.3 million of director expense (included in other expense on the consolidated statements of income) for a total restricted stock grant of 4,257 shares with immediate vesting to non-employee directors. During 2018 , the Company recognized approximately $0.2 million of director expense for a total restricted stock grant of 3,510 shares with immediate vesting to non-employee directors. As of September 30, 2019 , there was approximately $9.9 million of unrecognized compensation cost related to equity award grants. The cost is expected to be recognized over the remaining vesting period of approximately three years. The Company recognized a tax benefit of approximately $1.0 million and $0.2 million for the nine months ended September 30, 2019 and 2018 , respectively, for the tax impact of stock option exercises and vesting of restricted stock.

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Sep. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Securities Available for Sale	Securities Available for Sale Amortized cost and fair value of securities available for sale are summarized as follows. September 30, 2019 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency securities $ 16,697 $ — $ 207 $ 16,490 State, county and municipals 147,186 798 198 147,786 Mortgage-backed securities 169,262 3,267 652 171,877 Corporate debt securities 79,749 3,408 10 83,147 Total $ 412,894 $ 7,473 $ 1,067 $ 419,300 December 31, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency securities $ 22,467 $ — $ 818 $ 21,649 State, county and municipals 163,702 76 3,252 160,526 Mortgage-backed securities 134,350 328 3,034 131,644 Corporate debt securities 87,352 66 1,093 86,325 Total $ 407,871 $ 470 $ 8,197 $ 400,144 The following table presents gross unrealized losses and the related estimated fair value of investment securities available for sale, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position. September 30, 2019 Less than 12 months 12 months or more Total ($ in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Number of Securities U.S. government agency securities $ — $ — $ 16,490 $ 207 $ 16,490 $ 207 3 State, county and municipals 44,012 138 8,370 60 52,382 198 139 Mortgage-backed securities 38,515 127 40,783 525 79,298 652 150 Corporate debt securities 2,044 10 — — 2,044 10 1 Total $ 84,571 $ 275 $ 65,643 $ 792 $ 150,214 $ 1,067 293 December 31, 2018 Less than 12 months 12 months or more Total ($ in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Number of Securities U.S. government agency securities $ — $ — $ 21,649 $ 818 $ 21,649 $ 818 3 State, county and municipals 16,136 98 130,975 3,154 147,111 3,252 440 Mortgage-backed securities 20,568 132 89,189 2,902 109,757 3,034 204 Corporate debt securities 51,592 677 9,757 416 61,349 1,093 33 Total $ 88,296 $ 907 $ 251,570 $ 7,290 $ 339,866 $ 8,197 680 As of September 30, 2019 , the Company does not consider its securities AFS with unrealized losses to be other-than-temporarily impaired, as the unrealized losses in each category have occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase, not credit deterioration. The Company has the ability and intent to hold its securities to maturity. There were no other-than-temporary impairments charged to earnings during the nine months ended September 30, 2019 or 2018 . The amortized cost and fair value of securities AFS by contractual maturity are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; as this is particularly inherent in mortgage-backed securities, these securities are not included in the maturity categories below. September 30, 2019 (in thousands) Amortized Cost Fair Value Due in less than one year $ 18,762 $ 18,770 Due in one year through five years 184,588 187,185 Due after five years through ten years 33,877 34,314 Due after ten years 6,405 7,154 243,632 247,423 Mortgage-backed securities 169,262 171,877 Securities AFS $ 412,894 $ 419,300 Proceeds and realized gains / losses from the sale of securities AFS were as follows. Nine Months Ended September 30, (in thousands) 2019 2018 Gross gains $ 152 $ — Gross losses (120 ) — Gains (losses) on sales of securities AFS, net $ 32 $ — Proceeds from sales of securities AFS $ 13,240 $ —

Loans, Allowance for Loan Losse

Loans, Allowance for Loan Losses, and Credit Quality	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loans, Allowance for Loan Losses, and Credit Quality	Loans, Allowance for Loan Losses, and Credit Quality The loan composition is summarized as follows. September 30, 2019 December 31, 2018 (in thousands) Amount % of Total Amount % of Total Commercial & industrial $ 763,742 34 % $ 684,920 32 % Owner-occupied commercial real estate (“CRE”) 456,508 20 441,353 20 Agricultural (“AG”) production 36,050 2 35,625 2 AG real estate 58,591 3 53,444 2 CRE investment 336,442 15 343,652 16 Construction & land development 61,810 3 80,599 4 Residential construction 41,496 2 30,926 1 Residential first mortgage 343,400 15 357,841 17 Residential junior mortgage 116,179 5 111,328 5 Retail & other 28,713 1 26,493 1 Loans 2,242,931 100 % 2,166,181 100 % Less allowance for loan losses (“ALLL”) 13,620 13,153 Loans, net $ 2,229,311 $ 2,153,028 Allowance for loan losses to loans 0.61 % 0.61 % As a further breakdown, loans are summarized by originated and acquired as follows. September 30, 2019 December 31, 2018 (in thousands) Originated Amount % of Total Acquired Amount % of Total Originated Amount % of Total Acquired Amount % of Total Commercial & industrial $ 660,040 40 % $ 103,702 18 % $ 568,100 38 % $ 116,820 17 % Owner-occupied CRE 321,323 19 135,185 23 283,531 19 157,822 23 AG production 11,450 1 24,600 4 11,113 1 24,512 4 AG real estate 38,616 2 19,975 3 31,374 2 22,070 3 CRE investment 180,427 11 156,015 26 171,087 12 172,565 25 Construction & land development 52,806 3 9,004 2 66,478 4 14,121 2 Residential construction 41,246 3 250 — 30,926 2 — — Residential first mortgage 228,312 14 115,088 19 220,368 15 137,473 20 Residential junior mortgage 89,241 5 26,938 5 78,379 5 32,949 5 Retail & other 27,232 2 1,481 — 23,809 2 2,684 1 Loans 1,650,693 100 % 592,238 100 % 1,485,165 100 % 681,016 100 % Less ALLL 12,064 1,556 11,448 1,705 Loans, net $ 1,638,629 $ 590,682 $ 1,473,717 $ 679,311 ALLL to loans 0.73 % 0.26 % 0.77 % 0.25 % Loans as a percent of total loans 74 % 26 % 69 % 31 % Practically all of the Company’s loans, commitments, and letters of credit have been granted to customers in the Company’s market area. Although the Company has a diversified loan portfolio, the credit risk in the loan portfolio is largely influenced by general economic conditions and trends of the counties and markets in which the debtors operate, and the resulting impact on the operations of borrowers or on the value of underlying collateral, if any. A roll forward of the allowance for loan losses is summarized as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 September 30, 2018 December 31, 2018 Beginning balance $ 13,153 $ 12,653 $ 12,653 Provision for loan losses 900 1,360 1,600 Charge-offs (629 ) (1,110 ) (1,213 ) Recoveries 196 89 113 Net (charge-offs) recoveries (433 ) (1,021 ) (1,100 ) Ending balance $ 13,620 $ 12,992 $ 13,153 The following tables present the balance and activity in the ALLL by portfolio segment and the recorded investment in loans by portfolio segment. TOTAL – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 Provision 356 (57 ) 85 46 32 (140 ) 357 (75 ) 71 225 900 Charge-offs (59 ) (13 ) — — — — (226 ) — (80 ) (251 ) (629 ) Recoveries 90 2 — — — — — 36 32 36 196 Net (charge-offs) recoveries 31 (11 ) — — — — (226 ) 36 (48 ) (215 ) (433 ) Ending balance $ 5,658 $ 2,779 $ 206 $ 347 $ 1,502 $ 370 $ 342 $ 1,607 $ 495 $ 314 $ 13,620 As % of ALLL 42 % 20 % 1 % 3 % 11 % 3 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ 308 $ — $ 119 $ — $ — $ — $ — $ — $ — $ — $ 427 Collectively evaluated 5,350 2,779 87 347 1,502 370 342 1,607 495 314 13,193 Ending balance $ 5,658 $ 2,779 $ 206 $ 347 $ 1,502 $ 370 $ 342 $ 1,607 $ 495 $ 314 $ 13,620 Loans: Individually evaluated $ 2,143 $ 2,552 $ 1,251 $ 1,089 $ 2,483 $ 427 $ — $ 2,560 $ 221 $ 12 $ 12,738 Collectively evaluated 761,599 453,956 34,799 57,502 333,959 61,383 41,496 340,840 115,958 28,701 2,230,193 Total loans $ 763,742 $ 456,508 $ 36,050 $ 58,591 $ 336,442 $ 61,810 $ 41,496 $ 343,400 $ 116,179 $ 28,713 $ 2,242,931 Less ALLL 5,658 2,779 206 347 1,502 370 342 1,607 495 314 13,620 Net loans $ 758,084 $ 453,729 $ 35,844 $ 58,244 $ 334,940 $ 61,440 $ 41,154 $ 341,793 $ 115,684 $ 28,399 $ 2,229,311 As a further breakdown, the ALLL is summarized by originated and acquired as follows. Originated – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 Provision 395 (17 ) 84 45 68 (111 ) 323 (42 ) 22 227 994 Charge-offs (59 ) (13 ) — — — — (226 ) — (20 ) (251 ) (569 ) Recoveries 90 2 — — — — — 36 27 36 191 Net (charge-offs) recoveries 31 (11 ) — — — — (226 ) 36 7 (215 ) (378 ) Ending balance $ 5,109 $ 2,411 $ 194 $ 300 $ 1,298 $ 320 $ 308 $ 1,394 $ 437 $ 293 $ 12,064 As % of ALLL 42 % 20 % 1 % 2 % 11 % 3 % 3 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ 308 $ — $ 119 $ — $ — $ — $ — $ — $ — $ — $ 427 Collectively evaluated 4,801 2,411 75 300 1,298 320 308 1,394 437 293 11,637 Ending balance $ 5,109 $ 2,411 $ 194 $ 300 $ 1,298 $ 320 $ 308 $ 1,394 $ 437 $ 293 $ 12,064 Loans: Individually evaluated $ 722 $ 1,792 $ 1,095 $ 878 $ — $ — $ — $ — $ — $ — $ 4,487 Collectively evaluated 659,318 319,531 10,355 37,738 180,427 52,806 41,246 228,312 89,241 27,232 1,646,206 Total loans $ 660,040 $ 321,323 $ 11,450 $ 38,616 $ 180,427 $ 52,806 $ 41,246 $ 228,312 $ 89,241 $ 27,232 $ 1,650,693 Less ALLL 5,109 2,411 194 300 1,298 320 308 1,394 437 293 12,064 Net loans $ 654,931 $ 318,912 $ 11,256 $ 38,316 $ 179,129 $ 52,486 $ 40,938 $ 226,918 $ 88,804 $ 26,939 $ 1,638,629 Acquired – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 Provision (39 ) (40 ) 1 1 (36 ) (29 ) 34 (33 ) 49 (2 ) (94 ) Charge-offs — — — — — — — — (60 ) — (60 ) Recoveries — — — — — — — — 5 — 5 Net (charge-offs) recoveries — — — — — — — — (55 ) — (55 ) Ending balance $ 549 $ 368 $ 12 $ 47 $ 204 $ 50 $ 34 $ 213 $ 58 $ 21 $ 1,556 As % of ALLL 35 % 24 % 1 % 3 % 13 % 3 % 2 % 14 % 4 % 1 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 549 368 12 47 204 50 34 213 58 21 1,556 Ending balance $ 549 $ 368 $ 12 $ 47 $ 204 $ 50 $ 34 $ 213 $ 58 $ 21 $ 1,556 Loans: Individually evaluated $ 1,421 $ 760 $ 156 $ 211 $ 2,483 $ 427 $ — $ 2,560 $ 221 $ 12 $ 8,251 Collectively evaluated 102,281 134,425 24,444 19,764 153,532 8,577 250 112,528 26,717 1,469 583,987 Total loans $ 103,702 $ 135,185 $ 24,600 $ 19,975 $ 156,015 $ 9,004 $ 250 $ 115,088 $ 26,938 $ 1,481 $ 592,238 Less ALLL 549 368 12 47 204 50 34 213 58 21 1,556 Net loans $ 103,153 $ 134,817 $ 24,588 $ 19,928 $ 155,811 $ 8,954 $ 216 $ 114,875 $ 26,880 $ 1,460 $ 590,682 For comparison purposes, the following tables present the balance and activity in the ALLL by portfolio segment and the recorded investment in loans by portfolio segment for the prior year-end period. TOTAL – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,934 $ 2,607 $ 129 $ 296 $ 1,388 $ 726 $ 251 $ 1,609 $ 488 $ 225 $ 12,653 Provision 1,107 300 (8 ) 5 119 (216 ) (40 ) 117 (51 ) 267 1,600 Charge-offs (813 ) (74 ) — — (37 ) — — (85 ) — (204 ) (1,213 ) Recoveries 43 14 — — — — — 5 35 16 113 Net (charge-offs) recoveries (770 ) (60 ) — — (37 ) — — (80 ) 35 (188 ) (1,100 ) Ending balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 As % of ALLL 40 % 22 % 1 % 2 % 11 % 4 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 5,271 2,847 121 301 1,470 510 211 1,646 472 304 13,153 Ending balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 Loans: Individually evaluated $ 2,927 $ 1,506 $ — $ 222 $ 1,686 $ 603 $ — $ 2,750 $ 233 $ 12 $ 9,939 Collectively evaluated 681,993 439,847 35,625 53,222 341,966 79,996 30,926 355,091 111,095 26,481 2,156,242 Total loans $ 684,920 $ 441,353 $ 35,625 $ 53,444 $ 343,652 $ 80,599 $ 30,926 $ 357,841 $ 111,328 $ 26,493 $ 2,166,181 Less ALLL 5,271 2,847 121 301 1,470 510 211 1,646 472 304 13,153 Net loans $ 679,649 $ 438,506 $ 35,504 $ 53,143 $ 342,182 $ 80,089 $ 30,715 $ 356,195 $ 110,856 $ 26,189 $ 2,153,028 As a further breakdown, the ALLL is summarized by originated and acquired as follows. Originated – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,192 $ 2,115 $ 112 $ 235 $ 1,154 $ 628 $ 200 $ 1,297 $ 409 $ 200 $ 10,542 Provision 1,262 385 (2 ) 20 113 (197 ) 11 187 (31 ) 266 2,014 Charge-offs (813 ) (64 ) — — (37 ) — — (85 ) — (201 ) (1,200 ) Recoveries 42 3 — — — — — 1 30 16 92 Net (charge-offs) recoveries (771 ) (61 ) — — (37 ) — — (84 ) 30 (185 ) (1,108 ) Ending balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 As % of ALLL 41 % 21 % 1 % 2 % 11 % 4 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 4,683 2,439 110 255 1,230 431 211 1,400 408 281 11,448 Ending balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 Loans: Individually evaluated $ 227 $ 321 $ — $ — $ — $ — $ — $ — $ — $ — $ 548 Collectively evaluated 567,873 283,210 11,113 31,374 171,087 66,478 30,926 220,368 78,379 23,809 1,484,617 Total loans $ 568,100 $ 283,531 $ 11,113 $ 31,374 $ 171,087 $ 66,478 $ 30,926 $ 220,368 $ 78,379 $ 23,809 $ 1,485,165 Less ALLL 4,683 2,439 110 255 1,230 431 211 1,400 408 281 11,448 Net loans $ 563,417 $ 281,092 $ 11,003 $ 31,119 $ 169,857 $ 66,047 $ 30,715 $ 218,968 $ 77,971 $ 23,528 $ 1,473,717 Acquired – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 742 $ 492 $ 17 $ 61 $ 234 $ 98 $ 51 $ 312 $ 79 $ 25 $ 2,111 Provision (155 ) (85 ) (6 ) (15 ) 6 (19 ) (51 ) (70 ) (20 ) 1 (414 ) Charge-offs — (10 ) — — — — — — — (3 ) (13 ) Recoveries 1 11 — — — — — 4 5 — 21 Net (charge-offs) recoveries 1 1 — — — — — 4 5 (3 ) 8 Ending balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 As % of ALLL 34 % 24 % 1 % 3 % 14 % 5 % — % 14 % 4 % 1 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 588 408 11 46 240 79 — 246 64 23 1,705 Ending balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 Loans: Individually evaluated $ 2,700 $ 1,185 $ — $ 222 $ 1,686 $ 603 $ — $ 2,750 $ 233 $ 12 $ 9,391 Collectively evaluated 114,120 156,637 24,512 21,848 170,879 13,518 — 134,723 32,716 2,672 671,625 Total loans $ 116,820 $ 157,822 $ 24,512 $ 22,070 $ 172,565 $ 14,121 $ — $ 137,473 $ 32,949 $ 2,684 $ 681,016 Less ALLL 588 408 11 46 240 79 — 246 64 23 1,705 Net loans $ 116,232 $ 157,414 $ 24,501 $ 22,024 $ 172,325 $ 14,042 $ — $ 137,227 $ 32,885 $ 2,661 $ 679,311 The following table presents nonaccrual loans by portfolio segment in total and then as a further breakdown by originated or acquired. Total Nonaccrual Loans (in thousands) September 30, 2019 % of Total December 31, 2018 % of Total Commercial & industrial $ 2,279 25 % $ 2,816 52 % Owner-occupied CRE 2,302 25 673 12 AG production 1,251 14 — — AG real estate 846 9 164 3 CRE investment 1,111 12 210 4 Construction & land development — — 80 1 Residential construction — — 1 — Residential first mortgage 865 9 1,265 23 Residential junior mortgage 576 6 262 5 Retail & other 8 — — — Nonaccrual loans $ 9,238 100 % $ 5,471 100 % Percent of total loans 0.4 % 0.2 % September 30, 2019 December 31, 2018 (in thousands) Originated Amount % of Total Acquired Amount % of Total Originated Amount % of Total Acquired Amount % of Total Commercial & industrial $ 833 16 % $ 1,446 35 % $ 352 25 % $ 2,464 61 % Owner-occupied CRE 1,792 35 510 12 362 26 311 8 AG production 1,095 22 156 4 — — — — AG real estate 635 13 211 5 — — 164 4 CRE investment — — 1,111 27 — — 210 5 Construction & land development — — — — — — 80 2 Residential construction — — — — 1 — — — Residential first mortgage 458 9 407 10 629 45 636 15 Residential junior mortgage 263 5 313 7 65 4 197 5 Retail & other — — 8 — — — — — Nonaccrual loans $ 5,076 100 % $ 4,162 100 % $ 1,409 100 % $ 4,062 100 % Percent of nonaccrual loans 55 % 45 % 26 % 74 % The following tables present past due loans by portfolio segment. September 30, 2019 (in thousands) 30-89 Days Past Due (accruing) 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 215 $ 2,279 $ 761,248 $ 763,742 Owner-occupied CRE — 2,302 454,206 456,508 AG production — 1,251 34,799 36,050 AG real estate — 846 57,745 58,591 CRE investment — 1,111 335,331 336,442 Construction & land development — — 61,810 61,810 Residential construction — — 41,496 41,496 Residential first mortgage 319 865 342,216 343,400 Residential junior mortgage 283 576 115,320 116,179 Retail & other 124 8 28,581 28,713 Total loans $ 941 $ 9,238 $ 2,232,752 $ 2,242,931 Percent of total loans — % 0.4 % 99.6 % 100.0 % December 31, 2018 (in thousands) 30-89 Days Past Due (accruing) 90 Days & Over or nonaccrual Current Total Commercial & industrial $ — $ 2,816 $ 682,104 $ 684,920 Owner-occupied CRE 557 673 440,123 441,353 AG production 19 — 35,606 35,625 AG real estate 35 164 53,245 53,444 CRE investment 180 210 343,262 343,652 Construction & land development — 80 80,519 80,599 Residential construction — 1 30,925 30,926 Residential first mortgage 758 1,265 355,818 357,841 Residential junior mortgage 12 262 111,054 111,328 Retail & other 10 — 26,483 26,493 Total loans $ 1,571 $ 5,471 $ 2,159,139 $ 2,166,181 Percent of total loans 0.1 % 0.2 % 99.7 % 100.0 % A description of the loan risk categories used by the Company follows. Grades 1-4, Pass: Credits exhibit adequate cash flows, appropriate management and financial ratios within industry norms and/or are supported by sufficient collateral. Some credits in these rating categories may require a need for monitoring but elements of concern are not severe enough to warrant an elevated rating. Grade 5, Watch: Credits with this rating are adequately secured and performing but are being monitored due to the presence of various short-term weaknesses which may include unexpected, short-term adverse financial performance, managerial problems, potential impact of a decline in the entire industry or local economy and delinquency issues. Loans to individuals or loans supported by guarantors with marginal net worth or collateral may be included in this rating category. Grade 6, Special Mention: Credits with this rating have potential weaknesses that, without the Company’s attention and correction may result in deterioration of repayment prospects. These assets are considered Criticized Assets. Potential weaknesses may include adverse financial trends for the borrower or industry, repeated lack of compliance with Company requests, increasing debt to net worth, serious management conditions and decreasing cash flow. Grade 7, Substandard: Assets with this rating are characterized by the distinct possibility the Company will sustain some loss if deficiencies are not corrected. All foreclosures, liquidations, and nonaccrual loans are considered to be categorized in this rating, regardless of collateral sufficiency. Grade 8, Doubtful: Assets with this rating exhibit all the weaknesses as one rated Substandard with the added characteristic that such weaknesses make collection or liquidation in full highly questionable. Grade 9, Loss: Assets in this category are considered uncollectible. Pursuing any recovery or salvage value is impractical but does not preclude partial recovery in the future. The following tables present total loans by risk categories. September 30, 2019 (in thousands) Grades 1- 4 Grade 5 Grade 6 Grade 7 Grade 8 Grade 9 Total Commercial & industrial $ 725,484 $ 22,299 $ 2,076 $ 13,883 $ — $ — $ 763,742 Owner-occupied CRE 428,332 15,110 963 12,103 — — 456,508 AG production 27,350 4,044 1,669 2,987 — — 36,050 AG real estate 48,740 4,077 2,344 3,430 — — 58,591 CRE investment 332,078 2,345 908 1,111 — — 336,442 Construction & land development 61,794 — 16 — — — 61,810 Residential construction 41,496 — — — — — 41,496 Residential first mortgage 338,627 1,664 1,193 1,916 — — 343,400 Residential junior mortgage 115,595 — — 584 — — 116,179 Retail & other 28,705 — — 8 — — 28,713 Total loans $ 2,148,201 $ 49,539 $ 9,169 $ 36,022 $ — $ — $ 2,242,931 Percent of total 95.8 % 2.2 % 0.4 % 1.6 % — — 100.0 % December 31, 2018 (in thousands) Grades 1- 4 Grade 5 Grade 6 Grade 7 Grade 8 Grade 9 Total Commercial & industrial $ 649,475 $ 16,145 $ 6,178 $ 13,122 $ — $ — $ 684,920 Owner-occupied CRE 405,198 22,776 6,569 6,810 — — 441,353 AG production 29,363 3,302 2,351 609 — — 35,625 AG real estate 46,248 3,246 2,983 967 — — 53,444 CRE investment 334,080 6,792 — 2,780 — — 343,652 Construction & land development 75,365 5,138 16 80 — — 80,599 Residential construction 30,926 — — — — — 30,926 Residential first mortgage 353,239 1,406 510 2,686 — — 357,841 Residential junior mortgage 111,037 17 — 274 — — 111,328 Retail & other 26,493 — — — — — 26,493 Total loans $ 2,061,424 $ 58,822 $ 18,607 $ 27,328 $ — $ — $ 2,166,181 Percent of total 95.1 % 2.7 % 0.9 % 1.3 % — — 100.0 % The following tables present impaired loans. Total Impaired Loans – September 30, 2019 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Commercial & industrial $ 2,143 $ 4,271 $ 308 $ 2,807 $ 739 Owner-occupied CRE 2,552 2,930 — 2,742 170 AG production 1,251 1,263 119 1,295 12 AG real estate 1,089 1,091 — 1,098 2 CRE investment 2,483 2,490 — 2,524 8 Construction & land development 427 427 — 480 — Residential construction — — — — — Residential first mortgage 2,560 2,785 — 2,611 97 Residential junior mortgage 221 231 — 225 2 Retail & other 12 15 — 12 3 Total $ 12,738 $ 15,503 $ 427 $ 13,794 $ 1,033 Originated impaired loans $ 4,487 $ 4,707 $ 427 $ 4,649 $ 176 Acquired impaired loans 8,251 10,796 — 9,145 857 Total $ 12,738 $ 15,503 $ 427 $ 13,794 $ 1,033 Total Impaired Loans – December 31, 2018 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Commercial & industrial $ 2,927 $ 6,736 $ — $ 4,041 $ 660 Owner-occupied CRE 1,506 1,833 — 1,659 137 AG production — — — — — AG real estate 222 281 — 238 26 CRE investment 1,686 2,484 — 1,606 163 Construction & land development 603 1,506 — 603 21 Residential construction — — — — — Residential first mortgage 2,750 2,907 — 2,478 176 Residential junior mortgage 233 262 — 62 15 Retail & other 12 12 — 12 1 Total $ 9,939 $ 16,021 $ — $ 10,699 $ 1,199 Originated impaired loans $ 548 $ 548 $ — $ 899 $ 154 Acquired impaired loans 9,391 15,473 — 9,800 1,045 Total $ 9,939 $ 16,021 $ — $ 10,699 $ 1,199 Total purchased credit impaired loans (in aggregate since the Company’s 2013 acquisitions) were initially recorded at a fair value of $43.6 million on their respective acquisition dates, net of an initial $34.4 million nonaccretable mark and a zero accretable mark. At September 30, 2019 , $8.3 million of the $43.6 million remain in impaired loans. Nonaccretable discount on purchased credit impaired loans: Nine Months Ended Year Ended (in thousands) September 30, 2019 September 30, 2018 December 31, 2018 Balance at beginning of period $ 6,408 $ 9,471 $ 9,471 Accretion to loan interest income (3,293 ) (1,872 ) (1,976 ) Transferred to accretable — (513 ) (990 ) Disposals of loans (660 ) (97 ) (97 ) Balance at end of period $ 2,455 $ 6,989 $ 6,408 Troubled Debt Restructurings At September 30, 2019 , there were five loans classified as troubled debt restructurings with a current outstanding balance of $1.2 million (including performing TDRs of $0.5 million and the remainder on nonaccrual) and pre-modification balance of $1.4 million . In comparison, at December 31, 2018 , there were four loans classified as troubled debt restructurings with an outstanding balance of $0.6 million and pre-modification balance of $2.7 million . There were no loans classified as troubled debt restructurings during the previous twelve months that subsequently defaulted during the nine months ended September 30, 2019 . As of September 30, 2019 , there were no commitments to lend additional funds to debtors whose terms have been modified in troubled debt restructurings.

Goodwill and Other Intangibles

Goodwill and Other Intangibles and Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles and Mortgage Servicing Rights	Goodwill and Other Intangibles and Mortgage Servicing Rights Management periodically reviews the carrying value of its intangible assets to determine if any impairment has occurred, in which case an impairment charge would be recorded as an expense in the period of impairment, or whether changes in circumstances have occurred that would require a revision to the remaining useful life which would impact expense prospectively. In making such determination, management evaluates whether there are any adverse qualitative factors indicating that an impairment may exist, as well as the performance, on an undiscounted basis, of the underlying operations or assets which give rise to the intangible. The Company’s quarterly assessment indicated no impairment charge on goodwill, core deposit intangibles or customer list intangibles was required for the year ended December 31, 2018 or the nine months ended September 30, 2019 . A summary of goodwill and other intangibles was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Goodwill $ 107,366 $ 107,366 Core deposit intangibles 10,006 12,562 Customer list intangibles 3,999 4,379 Other intangibles 14,005 16,941 Goodwill and other intangibles, net $ 121,371 $ 124,307 Goodwill : Goodwill was $107.4 million at both September 30, 2019 and December 31, 2018 . Other intangible assets : Other intangible assets, consisting of core deposit intangibles and customer list intangibles, are amortized over their estimated finite lives. Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Core deposit intangibles: Gross carrying amount $ 29,015 $ 29,015 Accumulated amortization (19,009 ) (16,453 ) Net book value $ 10,006 $ 12,562 Additions during the period $ — $ — Amortization during the period $ 2,556 $ 3,915 Customer list intangibles: Gross carrying amount $ 5,523 $ 5,523 Accumulated amortization (1,524 ) (1,144 ) Net book value $ 3,999 $ 4,379 Additions during the period $ — $ 290 Amortization during the period $ 380 $ 474 Mortgage servicing rights : Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date, with the amortization recorded in mortgage income, net, in the consolidated statements of income. Mortgage servicing rights are carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, and are included in other assets in the consolidated balance sheets. A summary of the changes in the mortgage servicing rights asset was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Mortgage servicing rights ("MSR") asset: MSR asset at beginning of year $ 3,749 $ 3,187 Capitalized MSR 1,807 1,203 Amortization during the period (611 ) (641 ) MSR asset at end of period $ 4,945 $ 3,749 Fair value of MSR asset at end of period $ 6,960 $ 6,347 Residential mortgage loans serviced for others $ 721,569 $ 603,446 Net book value of MSR asset to loans serviced for others 0.69 % 0.62 % The Company periodically evaluates its mortgage servicing rights asset for impairment. At each reporting date, impairment is assessed based on estimated fair value using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). No valuation allowance or impairment charge was recorded for the year ended December 31, 2018 or the nine months ended September 30, 2019 . See Note 9 for additional information on the fair value of the MSR asset. The following table shows the estimated future amortization expense for amortizing intangible assets and the MSR asset. The projections are based on existing asset balances, the current interest rate environment and prepayment speeds as of September 30, 2019 . The actual amortization expense the Company recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements and events or circumstances that indicate the carrying amount of an asset may not be recoverable. (in thousands) Core deposit intangibles Customer list intangibles MSR asset Year ending December 31, 2019 (remaining three months) $ 781 $ 127 $ 224 2020 2,657 507 879 2021 2,167 507 730 2022 1,735 507 730 2023 1,273 483 658 2024 841 449 400 Thereafter 552 1,419 1,324 Total $ 10,006 $ 3,999 $ 4,945

Short and Long-Term Borrowings

Short and Long-Term Borrowings	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Short and Long-Term Borrowings	Short and Long-Term Borrowings Short-Term Borrowings: The Company did not have any short-term borrowings (borrowing with an original maturity of one year or less) outstanding at September 30, 2019 or December 31, 2018 . Long-Term Borrowings: The components of long-term borrowings (borrowing with an original maturity greater than one year) were as follows. (in thousands) September 30, 2019 December 31, 2018 FHLB advances $ 15,056 $ 35,252 Junior subordinated debentures 30,455 30,096 Subordinated notes 11,984 11,957 Total long-term borrowings $ 57,495 $ 77,305 Percent of fixed rate long-term borrowings 58 % 69 % Percent of floating rate long-term borrowings 42 % 31 % FHLB Advances : The FHLB advances bear fixed rates, require interest-only monthly payments, and have maturity dates through 2022. The weighted average rate of the FHLB advances was 1.95% at September 30, 2019 and 1.72% at December 31, 2018 . During third quarter 2019, the Company repaid a $20 million puttable FHLB advance. Junior Subordinated Debentures : The following table shows the breakdown of junior subordinated debentures. Interest on all debentures is current. Any applicable discounts (initially recorded to carry an acquired debenture at its then estimated fair market value) are being accreted to interest expense over the remaining life of the debentures. All the debentures below are currently callable and may be redeemed in part or in full at par plus any accrued but unpaid interest. At September 30, 2019 and December 31, 2018 , $29.3 million and $28.9 million , respectively, qualify as Tier 1 capital. Junior Subordinated Debentures 9/30/2019 9/30/2019 12/31/18 (in thousands) Maturity Date Par Unamortized Discount Carrying Value Carrying Value 2004 Nicolet Bankshares Statutory Trust (1) 7/15/2034 $ 6,186 $ — $ 6,186 $ 6,186 2005 Mid-Wisconsin Financial Services, Inc. (2) 12/15/2035 10,310 (3,222 ) 7,088 6,939 2006 Baylake Corp. (3) 9/30/2036 16,598 (3,942 ) 12,656 12,478 2004 First Menasha Bancshares, Inc. (4) 3/17/2034 5,155 (630 ) 4,525 4,493 Total $ 38,249 $ (7,794 ) $ 30,455 $ 30,096 (1) The interest rate is 8.00% fixed. (2) The debentures, assumed in April 2013 as the result of an acquisition, have a floating rate of the three-month LIBOR plus 1.43% , adjusted quarterly. The interest rates were 3.55% and 4.22% as of September 30, 2019 and December 31, 2018 , respectively. (3) The debentures, assumed in April 2016 as a result of an acquisition, have a floating rate of the three-month LIBOR plus 1.35% , adjusted quarterly. The interest rates were 3.45% and 4.15% as of September 30, 2019 and December 31, 2018 , respectively. (4) The debentures, assumed in April 2017 as the result of an acquisition, have a floating rate of the three-month LIBOR plus 2.79% , adjusted quarterly. The interest rates were 4.93% and 5.58% as of September 30, 2019 and December 31, 2018 , respectively. Subordinated Notes : In 2015, the Company placed an aggregate of $12 million in subordinated Notes in private placements with certain accredited investors. All Notes were issued with 10 -year maturities, have a fixed annual interest rate of 5% payable quarterly, are callable on or after the fifth anniversary of their respective issuances dates, and qualify for Tier 2 capital for regulatory purposes.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the estimated price at which an orderly transaction to sell an asset or transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept), and is a market-based measurement versus an entity-specific measurement. The Company records and/or discloses financial instruments on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the assumptions used to determine fair value. These levels are: • Level 1 – quoted market prices in active markets for identical assets or liabilities that a company has the ability to access at the measurement date • Level 2 – inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly • Level 3 – significant unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity In instances where the fair value measurement is based on inputs from different levels, the level within which the entire fair value measurement will be categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. This assessment of the significance of an input requires management judgment. Recurring basis fair value measurements: The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Recurring Basis: Total Level 1 Level 2 Level 3 September 30, 2019 U.S. government agency securities $ 16,490 $ — $ 16,490 $ — State, county and municipals 147,786 — 147,786 — Mortgage-backed securities 171,877 — 171,877 — Corporate debt securities 83,147 — 80,317 2,830 Securities AFS $ 419,300 $ — $ 416,470 $ 2,830 Other investments (equity securities) $ 4,080 $ 4,080 $ — $ — December 31, 2018 U.S. government agency securities $ 21,649 $ — $ 21,649 $ — State, county and municipals 160,526 — 160,460 66 Mortgage-backed securities 131,644 — 131,644 — Corporate debt securities 86,325 — 77,901 8,424 Securities AFS $ 400,144 $ — $ 391,654 $ 8,490 Other investments (equity securities) $ 2,650 $ 2,650 $ — $ — The following is a description of the valuation methodologies used by the Company for the securities AFS and equity securities measured at fair value on a recurring basis, noted in the tables above. Where quoted market prices on securities exchanges are available, the investments are classified as Level 1. Level 1 investments primarily include exchange-traded equity securities. If quoted market prices are not available, fair value is generally determined using prices obtained from independent pricing vendors who use pricing models (with typical inputs including benchmark yields, reported trades for similar securities, issuer spreads or relationship to other benchmark quoted securities), or discounted cash flows, and are classified as Level 2. Examples of these investments include U.S. government agency securities, mortgage-backed securities, obligations of state, county and municipals, and certain corporate debt securities. Finally, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, investments are classified within Level 3 of the hierarchy. Examples of these include private municipal bonds and corporate debt securities, which include trust preferred security investments. At September 30, 2019 and December 31, 2018 , it was determined that carrying value was the best approximation of fair value for these Level 3 securities, based primarily on the internal analysis on these securities. The following table presents the changes in the Level 3 securities AFS measured at fair value on a recurring basis. (in thousands) Nine Months Ended Year Ended Level 3 Fair Value Measurements: September 30, 2019 December 31, 2018 Balance at beginning of year $ 8,490 $ 9,151 Paydowns/Sales/Settlements (5,660 ) (661 ) Balance at end of period $ 2,830 $ 8,490 Nonrecurring basis fair value measurements: The following table presents the Company’s assets measured at fair value on a nonrecurring basis, aggregated by level in the fair value hierarchy within which those measurements fall. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Nonrecurring Basis: Total Level 1 Level 2 Level 3 September 30, 2019 Impaired loans $ 12,311 $ — $ — $ 12,311 Other real estate owned (“OREO”) 1,325 — — 1,325 MSR asset 6,960 — — 6,960 December 31, 2018 Impaired loans $ 9,939 $ — $ — $ 9,939 OREO 420 — — 420 MSR asset 6,347 — — 6,347 The following is a description of the valuation methodologies used by the Company for the items noted in the table above. For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note. For OREO, the fair value is based upon the estimated fair value of the underlying collateral adjusted for the expected costs to sell. To estimate the fair value of the MSR asset, the underlying serviced loan pools are stratified by interest rate tranche and term of the loan, and a valuation model is used to calculate the present value of the expected future cash flows for each stratum. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as costs to service, a discount rate, ancillary income, default rates and losses, and prepayment speeds. Although some of these assumptions are based on observable market data, other assumptions are based on unobservable estimates of what market participants would use to measure fair value. Financial instruments: The carrying amounts and estimated fair values of the Company’s financial instruments are shown below. September 30, 2019 (in thousands) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 143,969 $ 143,969 $ 143,969 $ — $ — Certificates of deposit in other banks 5,395 5,390 — 5,390 — Securities AFS 419,300 419,300 — 416,470 2,830 Other investments, including equity securities 20,697 20,697 4,080 13,259 3,358 Loans held for sale 10,564 10,710 — 10,710 — Loans, net 2,229,311 2,244,410 — — 2,244,410 BOLI 71,796 71,796 71,796 — — MSR asset 4,945 6,960 — — 6,960 Financial liabilities: Deposits $ 2,584,447 $ 2,584,662 $ — $ — $ 2,584,662 Long-term borrowings 57,495 56,679 — 15,135 41,544 December 31, 2018 (in thousands) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 249,526 $ 249,526 $ 249,526 $ — $ — Certificates of deposit in other banks 993 993 — 993 — Securities AFS 400,144 400,144 — 391,654 8,490 Other investments, including equity securities 17,997 17,997 2,650 13,189 2,158 Loans held for sale 1,639 1,662 — 1,662 — Loans, net 2,153,028 2,139,322 — — 2,139,322 BOLI 66,310 66,310 66,310 — — MSR asset 3,749 6,347 — — 6,347 Financial liabilities: Deposits $ 2,614,138 $ 2,614,995 $ — $ — $ 2,614,995 Long-term borrowings 77,305 75,923 — 34,907 41,016 The carrying value of certain assets and liabilities such as cash and cash equivalents, BOLI, and nonmaturing deposits, approximate their estimated fair value. For those financial instruments not previously disclosed, the following is a description of the valuation methodologies used. Certificates of deposits in other banks: Fair values are estimated using discounted cash flow analysis based on current interest rates being offered by instruments with similar terms and represents a Level 2 measurement. Other investments: The valuation methodologies utilized for exchange-traded equity securities are discussed under “Recurring basis fair value measurements” above. The carrying amount of Federal Reserve Bank and FHLB stock is a reasonably accepted fair value estimate given their restricted nature. Fair value is the redeemable (carrying) value based on the redemption provisions of the instruments which is considered a Level 2 measurement. The carrying amount of the remaining other investments (particularly common stocks of companies or other banks that are not publicly traded) approximates their fair value, determined primarily by analysis of company financial statements and recent capital issuances of the respective companies or banks, if any, and represents a Level 3 measurement. Loans held for sale: The fair value estimation process for the loans held for sale portfolio is segregated by loan type. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics and represents a Level 2 measurement. Loans, net : For variable-rate loans that reprice frequently and with no significant change in credit risk or other optionality, fair values are based on carrying values. Fair values for all other loans are estimated by discounting contractual cash flows using estimated market discount rates, which reflect the credit and interest rate risk inherent in the loan. Collateral-dependent impaired loans are included in loans, net. The fair value of loans is considered to be a Level 3 measurement due to internally developed discounted cash flow measurements. Deposits : The fair value of deposits with no stated maturity (such as demand deposits, savings, interest and noninterest checking, and money market accounts) is, by definition, equal to the amount payable on demand at the reporting date. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered in the market place on certificates of similar remaining maturities. Use of internal discounted cash flows provides a Level 3 fair value measurement. Long-term borrowings : The fair value of the FHLB advances is obtained from the FHLB which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities and represents a Level 2 measurement. The fair values of the junior subordinated debentures and subordinated notes utilize a discounted cash flow analysis based on an estimate of current interest rates being offered by instruments with similar terms and credit quality. Since the market for these instruments is limited, the internal evaluation represents a Level 3 measurement. Lending-related commitments and derivative financial instruments : At September 30, 2019 and December 31, 2018 , the estimated fair value of letters of credit, interest rate lock commitments on residential mortgage loans, outstanding mandatory commitments to sell residential mortgage loans into the secondary market, and mirror interest rate swap agreements were not significant. Limitations : Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Fair value estimates may not be realizable in an immediate settlement of the instrument. In some instances, there are no quoted market prices for the Company’s various financial instruments, in which case fair values may be based on estimates using present value or other valuation techniques, or based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of the financial instruments, or other factors. Those techniques are significantly affected by the assumptions used, including the discount rate and estimate of future cash flows. Subsequent changes in assumptions could significantly affect the estimates.

Operating Leases

Operating Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Operating Leases	Operating Leases As of January 1, 2019, the Company adopted ASU 2016-02 (Topic 842) on a prospective basis using the effective date method. The adoption of the new standard did not have a material impact on Nicolet's financial statements; however, additional disclosures have been added in accordance with the ASU. See Note 1 for additional information on this new accounting standard. The operating lease ROU asset represents the right to use an underlying asset during the lease term, while the operating lease liability represents the obligation to make lease payments arising from the lease. The ROU asset and lease liability are recognized at lease commencement based on the present value of the remaining lease payments, considering a discount rate that represents Nicolet's incremental borrowing rate. Operating lease expense is recognized on a straight-line basis over the lease term and is recognized in occupancy, equipment, and office on the consolidated statements of income. Nicolet leases space under non-cancelable operating lease agreements for certain bank and nonbank branch facilities with remaining lease terms of 2 to 7 years. Certain lease arrangements contain extension options which typically range from 5 to 10 years at the then fair market rental rates. The lease asset and liability considers renewal options when they are reasonably certain of being exercised. A summary of net lease cost and selected other information related to operating leases was as follows. Nine Months Ended ($ in thousands) September 30, 2019 Net lease cost: Operating lease cost $ 737 Variable lease cost 179 Net lease cost $ 916 Selected other operating lease information: Weighted average remaining lease term (years) 5 Weighted average discount rate 2.5 % The following table summarizes the maturity of remaining lease liabilities. (in thousands) Year ending December 31, 2019 (remaining three months) $ 951 2020 1,037 2021 911 2022 851 2023 607 2024 499 Thereafter 16 Total future minimum lease payments 4,872 Less: amount representing interest (122 ) Present value of net future minimum lease payments $ 4,750

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
General	General In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the consolidated balance sheets, statements of income, comprehensive income, changes in stockholders’ equity and cash flows of Nicolet Bankshares, Inc. (the “Company” or “Nicolet”) and its subsidiaries, for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions and balances have been eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year. These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted or abbreviated. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 .
Critical Accounting Policies and Estimates	Critical Accounting Policies and Estimates Preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future. Estimates are used in accounting for, among other items, the allowance for loan losses, valuation of loans in acquisition transactions, useful lives for depreciation and amortization, fair value of financial instruments, other-than-temporary impairment calculations, valuation of deferred tax assets, uncertain income tax positions and contingencies. Estimates that are particularly susceptible to significant change for the Company include the determination of the allowance for loan losses, the determination and assessment of deferred tax assets and liabilities, and the valuation of loans acquired in acquisition transactions; therefore, these are critical accounting policies. Factors that may cause sensitivity to the aforementioned estimates include but are not limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, changes in applicable banking or tax regulations, and changes to deferred tax estimates. Actual results may ultimately differ from estimates, although management does not generally believe such differences would materially affect the consolidated financial statements in any individual reporting period presented. There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 .
Recent Accounting Developments Adopted	Recent Accounting Developments Adopted In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . ASU 2017-12 expands the activities that qualify for hedge accounting and simplifies the rules for reporting hedging transactions. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company adopted the updated guidance effective January 1, 2019 with no material impact on its consolidated financial statements, because the Company does not have any significant derivatives and does not currently apply hedge accounting to derivatives. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , with several subsequent updates. Topic 842 introduced a new accounting model for lessors and lessees. For lessees, almost all leases are now recognized on the balance sheet as a right-of-use ("ROU") asset and lease liability, unlike previous GAAP which required only capital leases to be recognized on the balance sheet. The accounting applied by lessors is largely unchanged from existing guidance. Topic 842 also requires additional disclosures concerning the amount, timing and uncertainty of cash flows arising from leases. The updated guidance is effective for annual reporting periods beginning after December 15, 2018, and provides a modified retrospective transition approach that allows lessees to recognize and measure leases on the balance sheet at the beginning of either the earliest period presented or as of the beginning of the period of adoption (the "effective date" method), with the option to elect certain practical expedients. Nicolet adopted the new guidance prospectively as of January 1, 2019, using the effective date method; thus, prior comparative periods have not been restated. Upon adoption, Nicolet recognized an ROU asset and lease liability of approximately $5 million . There was no impact to its consolidated statements of income or cash flows compared to the prior lease accounting model. The ROU asset and lease liability are recorded in other assets and other liabilities, respectively, in the consolidated balance sheets. As part of the adoption, Nicolet elected the package of practical expedients permitted under the transition guidance of the new standard which allowed the carry forward of the historical lease classification. Nicolet also elected the practical expedient to group lease and non-lease components as a single lease component; thus, the Company's leases include both lease (e.g., fixed payments including rent, taxes, and insurance costs) and non-lease components (e.g., common area or other maintenance costs). See Note 10 for the new disclosures required by Topic 842.
Reclassifications	Reclassifications Certain amounts in the 2018 consolidated financial statements have been reclassified to conform to the 2019 presentation.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of basic and diluted earnings per common share	Presented below are the calculations for basic and diluted earnings per common share. Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share data) 2019 2018 2019 2018 Net income attributable to Nicolet Bankshares, Inc. $ 13,530 $ 10,859 $ 42,346 $ 30,173 Weighted average common shares outstanding 9,347 9,633 9,394 9,679 Effect of dilutive common stock awards 350 316 313 325 Diluted weighted average common shares outstanding 9,697 9,949 9,707 10,004 Basic earnings per common share* $ 1.45 $ 1.13 $ 4.51 $ 3.12 Diluted earnings per common share* $ 1.40 $ 1.09 $ 4.36 $ 3.02 *Cumulative quarterly per share performance may not equal annual per share totals due to the effects of the amount and timing of capital increases. When computing earnings per share for an interim period, the denominator is based on the weighted average shares outstanding during the interim period, and not on an annualized weighted average basis. Accordingly, the sum of the earnings per share data for the quarters will not necessarily equal the year to date earnings per share data.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of weighted average assumption for stock option	The weighted average assumptions used in the Black-Scholes model for valuing stock option grants were as follows. Nine Months Ended September 30, 2019 2018 Dividend yield — % — % Expected volatility 25 % 25 % Risk-free interest rate 2.37 % 2.48 % Expected average life 7 years 7 years Weighted average per share fair value of options $ 19.23 $ 17.60
Schedule of stock options outstanding	A summary of the Company’s stock option activity is summarized below. Stock Options Option Shares Outstanding Weighted Average Exercise Price Weighted Average Remaining Life (Years) Aggregate Intrinsic Value (in thousands) Outstanding - December 31, 2018 1,581,699 $ 40.77 Granted 15,000 59.55 Exercise of stock options * (185,328 ) 23.64 Forfeited (3,538 ) 27.43 Outstanding - September 30, 2019 1,407,833 $ 43.25 7.0 $ 32,829 Exercisable - September 30, 2019 644,033 $ 39.28 6.5 $ 17,577 * The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the nine months ended September 30, 2019 , 70,068 such shares were surrendered to the Company.
Schedule of restricted stock awards	A summary of the Company’s restricted stock activity is summarized below. Restricted Stock Weighted Average Grant Date Fair Value Restricted Shares Outstanding Outstanding - December 31, 2018 $ 39.37 29,512 Granted 61.96 4,257 Vested * 45.05 (9,672 ) Forfeited 16.50 (408 ) Outstanding - September 30, 2019 $ 41.50 23,689 * The terms of the restricted stock agreements permit the surrender of shares to the Company upon vesting in order to satisfy applicable tax withholding requirements at the minimum statutory withholding rate, and accordingly, 1,637 shares were surrendered during the nine months ended September 30, 2019 .

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Schedule of amortized cost and fair value of securities available for sale	Amortized cost and fair value of securities available for sale are summarized as follows. September 30, 2019 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency securities $ 16,697 $ — $ 207 $ 16,490 State, county and municipals 147,186 798 198 147,786 Mortgage-backed securities 169,262 3,267 652 171,877 Corporate debt securities 79,749 3,408 10 83,147 Total $ 412,894 $ 7,473 $ 1,067 $ 419,300 December 31, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency securities $ 22,467 $ — $ 818 $ 21,649 State, county and municipals 163,702 76 3,252 160,526 Mortgage-backed securities 134,350 328 3,034 131,644 Corporate debt securities 87,352 66 1,093 86,325 Total $ 407,871 $ 470 $ 8,197 $ 400,144
Schedule of unrealized losses and fair value	The following table presents gross unrealized losses and the related estimated fair value of investment securities available for sale, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position. September 30, 2019 Less than 12 months 12 months or more Total ($ in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Number of Securities U.S. government agency securities $ — $ — $ 16,490 $ 207 $ 16,490 $ 207 3 State, county and municipals 44,012 138 8,370 60 52,382 198 139 Mortgage-backed securities 38,515 127 40,783 525 79,298 652 150 Corporate debt securities 2,044 10 — — 2,044 10 1 Total $ 84,571 $ 275 $ 65,643 $ 792 $ 150,214 $ 1,067 293 December 31, 2018 Less than 12 months 12 months or more Total ($ in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Number of Securities U.S. government agency securities $ — $ — $ 21,649 $ 818 $ 21,649 $ 818 3 State, county and municipals 16,136 98 130,975 3,154 147,111 3,252 440 Mortgage-backed securities 20,568 132 89,189 2,902 109,757 3,034 204 Corporate debt securities 51,592 677 9,757 416 61,349 1,093 33 Total $ 88,296 $ 907 $ 251,570 $ 7,290 $ 339,866 $ 8,197 680
Schedule of amortized cost and fair value classified by contractual maturities	The amortized cost and fair value of securities AFS by contractual maturity are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; as this is particularly inherent in mortgage-backed securities, these securities are not included in the maturity categories below. September 30, 2019 (in thousands) Amortized Cost Fair Value Due in less than one year $ 18,762 $ 18,770 Due in one year through five years 184,588 187,185 Due after five years through ten years 33,877 34,314 Due after ten years 6,405 7,154 243,632 247,423 Mortgage-backed securities 169,262 171,877 Securities AFS $ 412,894 $ 419,300
Schedule of proceeds from sale of securities AFS	Proceeds and realized gains / losses from the sale of securities AFS were as follows. Nine Months Ended September 30, (in thousands) 2019 2018 Gross gains $ 152 $ — Gross losses (120 ) — Gains (losses) on sales of securities AFS, net $ 32 $ — Proceeds from sales of securities AFS $ 13,240 $ —

Loans, Allowance for Loan Los_2

Loans, Allowance for Loan Losses, and Credit Quality (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Schedule of loan composition and further breakdown summarized by originated and acquired	The loan composition is summarized as follows. September 30, 2019 December 31, 2018 (in thousands) Amount % of Total Amount % of Total Commercial & industrial $ 763,742 34 % $ 684,920 32 % Owner-occupied commercial real estate (“CRE”) 456,508 20 441,353 20 Agricultural (“AG”) production 36,050 2 35,625 2 AG real estate 58,591 3 53,444 2 CRE investment 336,442 15 343,652 16 Construction & land development 61,810 3 80,599 4 Residential construction 41,496 2 30,926 1 Residential first mortgage 343,400 15 357,841 17 Residential junior mortgage 116,179 5 111,328 5 Retail & other 28,713 1 26,493 1 Loans 2,242,931 100 % 2,166,181 100 % Less allowance for loan losses (“ALLL”) 13,620 13,153 Loans, net $ 2,229,311 $ 2,153,028 Allowance for loan losses to loans 0.61 % 0.61 % As a further breakdown, loans are summarized by originated and acquired as follows. September 30, 2019 December 31, 2018 (in thousands) Originated Amount % of Total Acquired Amount % of Total Originated Amount % of Total Acquired Amount % of Total Commercial & industrial $ 660,040 40 % $ 103,702 18 % $ 568,100 38 % $ 116,820 17 % Owner-occupied CRE 321,323 19 135,185 23 283,531 19 157,822 23 AG production 11,450 1 24,600 4 11,113 1 24,512 4 AG real estate 38,616 2 19,975 3 31,374 2 22,070 3 CRE investment 180,427 11 156,015 26 171,087 12 172,565 25 Construction & land development 52,806 3 9,004 2 66,478 4 14,121 2 Residential construction 41,246 3 250 — 30,926 2 — — Residential first mortgage 228,312 14 115,088 19 220,368 15 137,473 20 Residential junior mortgage 89,241 5 26,938 5 78,379 5 32,949 5 Retail & other 27,232 2 1,481 — 23,809 2 2,684 1 Loans 1,650,693 100 % 592,238 100 % 1,485,165 100 % 681,016 100 % Less ALLL 12,064 1,556 11,448 1,705 Loans, net $ 1,638,629 $ 590,682 $ 1,473,717 $ 679,311 ALLL to loans 0.73 % 0.26 % 0.77 % 0.25 % Loans as a percent of total loans 74 % 26 % 69 % 31 %
Schedule of roll forward of allowance for loan losses	A roll forward of the allowance for loan losses is summarized as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 September 30, 2018 December 31, 2018 Beginning balance $ 13,153 $ 12,653 $ 12,653 Provision for loan losses 900 1,360 1,600 Charge-offs (629 ) (1,110 ) (1,213 ) Recoveries 196 89 113 Net (charge-offs) recoveries (433 ) (1,021 ) (1,100 ) Ending balance $ 13,620 $ 12,992 $ 13,153
Schedule of changes in ALLL by portfolio segment and further breakdown summarized by originated and acquired	For comparison purposes, the following tables present the balance and activity in the ALLL by portfolio segment and the recorded investment in loans by portfolio segment for the prior year-end period. TOTAL – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,934 $ 2,607 $ 129 $ 296 $ 1,388 $ 726 $ 251 $ 1,609 $ 488 $ 225 $ 12,653 Provision 1,107 300 (8 ) 5 119 (216 ) (40 ) 117 (51 ) 267 1,600 Charge-offs (813 ) (74 ) — — (37 ) — — (85 ) — (204 ) (1,213 ) Recoveries 43 14 — — — — — 5 35 16 113 Net (charge-offs) recoveries (770 ) (60 ) — — (37 ) — — (80 ) 35 (188 ) (1,100 ) Ending balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 As % of ALLL 40 % 22 % 1 % 2 % 11 % 4 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 5,271 2,847 121 301 1,470 510 211 1,646 472 304 13,153 Ending balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 Loans: Individually evaluated $ 2,927 $ 1,506 $ — $ 222 $ 1,686 $ 603 $ — $ 2,750 $ 233 $ 12 $ 9,939 Collectively evaluated 681,993 439,847 35,625 53,222 341,966 79,996 30,926 355,091 111,095 26,481 2,156,242 Total loans $ 684,920 $ 441,353 $ 35,625 $ 53,444 $ 343,652 $ 80,599 $ 30,926 $ 357,841 $ 111,328 $ 26,493 $ 2,166,181 Less ALLL 5,271 2,847 121 301 1,470 510 211 1,646 472 304 13,153 Net loans $ 679,649 $ 438,506 $ 35,504 $ 53,143 $ 342,182 $ 80,089 $ 30,715 $ 356,195 $ 110,856 $ 26,189 $ 2,153,028 The following tables present the balance and activity in the ALLL by portfolio segment and the recorded investment in loans by portfolio segment. TOTAL – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 5,271 $ 2,847 $ 121 $ 301 $ 1,470 $ 510 $ 211 $ 1,646 $ 472 $ 304 $ 13,153 Provision 356 (57 ) 85 46 32 (140 ) 357 (75 ) 71 225 900 Charge-offs (59 ) (13 ) — — — — (226 ) — (80 ) (251 ) (629 ) Recoveries 90 2 — — — — — 36 32 36 196 Net (charge-offs) recoveries 31 (11 ) — — — — (226 ) 36 (48 ) (215 ) (433 ) Ending balance $ 5,658 $ 2,779 $ 206 $ 347 $ 1,502 $ 370 $ 342 $ 1,607 $ 495 $ 314 $ 13,620 As % of ALLL 42 % 20 % 1 % 3 % 11 % 3 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ 308 $ — $ 119 $ — $ — $ — $ — $ — $ — $ — $ 427 Collectively evaluated 5,350 2,779 87 347 1,502 370 342 1,607 495 314 13,193 Ending balance $ 5,658 $ 2,779 $ 206 $ 347 $ 1,502 $ 370 $ 342 $ 1,607 $ 495 $ 314 $ 13,620 Loans: Individually evaluated $ 2,143 $ 2,552 $ 1,251 $ 1,089 $ 2,483 $ 427 $ — $ 2,560 $ 221 $ 12 $ 12,738 Collectively evaluated 761,599 453,956 34,799 57,502 333,959 61,383 41,496 340,840 115,958 28,701 2,230,193 Total loans $ 763,742 $ 456,508 $ 36,050 $ 58,591 $ 336,442 $ 61,810 $ 41,496 $ 343,400 $ 116,179 $ 28,713 $ 2,242,931 Less ALLL 5,658 2,779 206 347 1,502 370 342 1,607 495 314 13,620 Net loans $ 758,084 $ 453,729 $ 35,844 $ 58,244 $ 334,940 $ 61,440 $ 41,154 $ 341,793 $ 115,684 $ 28,399 $ 2,229,311 As a further breakdown, the ALLL is summarized by originated and acquired as follows. Originated – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 Provision 395 (17 ) 84 45 68 (111 ) 323 (42 ) 22 227 994 Charge-offs (59 ) (13 ) — — — — (226 ) — (20 ) (251 ) (569 ) Recoveries 90 2 — — — — — 36 27 36 191 Net (charge-offs) recoveries 31 (11 ) — — — — (226 ) 36 7 (215 ) (378 ) Ending balance $ 5,109 $ 2,411 $ 194 $ 300 $ 1,298 $ 320 $ 308 $ 1,394 $ 437 $ 293 $ 12,064 As % of ALLL 42 % 20 % 1 % 2 % 11 % 3 % 3 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ 308 $ — $ 119 $ — $ — $ — $ — $ — $ — $ — $ 427 Collectively evaluated 4,801 2,411 75 300 1,298 320 308 1,394 437 293 11,637 Ending balance $ 5,109 $ 2,411 $ 194 $ 300 $ 1,298 $ 320 $ 308 $ 1,394 $ 437 $ 293 $ 12,064 Loans: Individually evaluated $ 722 $ 1,792 $ 1,095 $ 878 $ — $ — $ — $ — $ — $ — $ 4,487 Collectively evaluated 659,318 319,531 10,355 37,738 180,427 52,806 41,246 228,312 89,241 27,232 1,646,206 Total loans $ 660,040 $ 321,323 $ 11,450 $ 38,616 $ 180,427 $ 52,806 $ 41,246 $ 228,312 $ 89,241 $ 27,232 $ 1,650,693 Less ALLL 5,109 2,411 194 300 1,298 320 308 1,394 437 293 12,064 Net loans $ 654,931 $ 318,912 $ 11,256 $ 38,316 $ 179,129 $ 52,486 $ 40,938 $ 226,918 $ 88,804 $ 26,939 $ 1,638,629 Acquired – Nine Months Ended September 30, 2019 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 Provision (39 ) (40 ) 1 1 (36 ) (29 ) 34 (33 ) 49 (2 ) (94 ) Charge-offs — — — — — — — — (60 ) — (60 ) Recoveries — — — — — — — — 5 — 5 Net (charge-offs) recoveries — — — — — — — — (55 ) — (55 ) Ending balance $ 549 $ 368 $ 12 $ 47 $ 204 $ 50 $ 34 $ 213 $ 58 $ 21 $ 1,556 As % of ALLL 35 % 24 % 1 % 3 % 13 % 3 % 2 % 14 % 4 % 1 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 549 368 12 47 204 50 34 213 58 21 1,556 Ending balance $ 549 $ 368 $ 12 $ 47 $ 204 $ 50 $ 34 $ 213 $ 58 $ 21 $ 1,556 Loans: Individually evaluated $ 1,421 $ 760 $ 156 $ 211 $ 2,483 $ 427 $ — $ 2,560 $ 221 $ 12 $ 8,251 Collectively evaluated 102,281 134,425 24,444 19,764 153,532 8,577 250 112,528 26,717 1,469 583,987 Total loans $ 103,702 $ 135,185 $ 24,600 $ 19,975 $ 156,015 $ 9,004 $ 250 $ 115,088 $ 26,938 $ 1,481 $ 592,238 Less ALLL 549 368 12 47 204 50 34 213 58 21 1,556 Net loans $ 103,153 $ 134,817 $ 24,588 $ 19,928 $ 155,811 $ 8,954 $ 216 $ 114,875 $ 26,880 $ 1,460 $ 590,682 As a further breakdown, the ALLL is summarized by originated and acquired as follows. Originated – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 4,192 $ 2,115 $ 112 $ 235 $ 1,154 $ 628 $ 200 $ 1,297 $ 409 $ 200 $ 10,542 Provision 1,262 385 (2 ) 20 113 (197 ) 11 187 (31 ) 266 2,014 Charge-offs (813 ) (64 ) — — (37 ) — — (85 ) — (201 ) (1,200 ) Recoveries 42 3 — — — — — 1 30 16 92 Net (charge-offs) recoveries (771 ) (61 ) — — (37 ) — — (84 ) 30 (185 ) (1,108 ) Ending balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 As % of ALLL 41 % 21 % 1 % 2 % 11 % 4 % 2 % 12 % 4 % 2 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 4,683 2,439 110 255 1,230 431 211 1,400 408 281 11,448 Ending balance $ 4,683 $ 2,439 $ 110 $ 255 $ 1,230 $ 431 $ 211 $ 1,400 $ 408 $ 281 $ 11,448 Loans: Individually evaluated $ 227 $ 321 $ — $ — $ — $ — $ — $ — $ — $ — $ 548 Collectively evaluated 567,873 283,210 11,113 31,374 171,087 66,478 30,926 220,368 78,379 23,809 1,484,617 Total loans $ 568,100 $ 283,531 $ 11,113 $ 31,374 $ 171,087 $ 66,478 $ 30,926 $ 220,368 $ 78,379 $ 23,809 $ 1,485,165 Less ALLL 4,683 2,439 110 255 1,230 431 211 1,400 408 281 11,448 Net loans $ 563,417 $ 281,092 $ 11,003 $ 31,119 $ 169,857 $ 66,047 $ 30,715 $ 218,968 $ 77,971 $ 23,528 $ 1,473,717 Acquired – Year Ended December 31, 2018 (in thousands) Commercial & industrial Owner- occupied CRE AG production AG real estate CRE investment Construction & land development Residential construction Residential first mortgage Residential junior mortgage Retail & other Total ALLL: Beginning balance $ 742 $ 492 $ 17 $ 61 $ 234 $ 98 $ 51 $ 312 $ 79 $ 25 $ 2,111 Provision (155 ) (85 ) (6 ) (15 ) 6 (19 ) (51 ) (70 ) (20 ) 1 (414 ) Charge-offs — (10 ) — — — — — — — (3 ) (13 ) Recoveries 1 11 — — — — — 4 5 — 21 Net (charge-offs) recoveries 1 1 — — — — — 4 5 (3 ) 8 Ending balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 As % of ALLL 34 % 24 % 1 % 3 % 14 % 5 % — % 14 % 4 % 1 % 100 % ALLL: Individually evaluated $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated 588 408 11 46 240 79 — 246 64 23 1,705 Ending balance $ 588 $ 408 $ 11 $ 46 $ 240 $ 79 $ — $ 246 $ 64 $ 23 $ 1,705 Loans: Individually evaluated $ 2,700 $ 1,185 $ — $ 222 $ 1,686 $ 603 $ — $ 2,750 $ 233 $ 12 $ 9,391 Collectively evaluated 114,120 156,637 24,512 21,848 170,879 13,518 — 134,723 32,716 2,672 671,625 Total loans $ 116,820 $ 157,822 $ 24,512 $ 22,070 $ 172,565 $ 14,121 $ — $ 137,473 $ 32,949 $ 2,684 $ 681,016 Less ALLL 588 408 11 46 240 79 — 246 64 23 1,705 Net loans $ 116,232 $ 157,414 $ 24,501 $ 22,024 $ 172,325 $ 14,042 $ — $ 137,227 $ 32,885 $ 2,661 $ 679,311
Schedule of nonaccrual loans by portfolio segment and further breakdown summarized by originated and acquired	The following table presents nonaccrual loans by portfolio segment in total and then as a further breakdown by originated or acquired. Total Nonaccrual Loans (in thousands) September 30, 2019 % of Total December 31, 2018 % of Total Commercial & industrial $ 2,279 25 % $ 2,816 52 % Owner-occupied CRE 2,302 25 673 12 AG production 1,251 14 — — AG real estate 846 9 164 3 CRE investment 1,111 12 210 4 Construction & land development — — 80 1 Residential construction — — 1 — Residential first mortgage 865 9 1,265 23 Residential junior mortgage 576 6 262 5 Retail & other 8 — — — Nonaccrual loans $ 9,238 100 % $ 5,471 100 % Percent of total loans 0.4 % 0.2 % September 30, 2019 December 31, 2018 (in thousands) Originated Amount % of Total Acquired Amount % of Total Originated Amount % of Total Acquired Amount % of Total Commercial & industrial $ 833 16 % $ 1,446 35 % $ 352 25 % $ 2,464 61 % Owner-occupied CRE 1,792 35 510 12 362 26 311 8 AG production 1,095 22 156 4 — — — — AG real estate 635 13 211 5 — — 164 4 CRE investment — — 1,111 27 — — 210 5 Construction & land development — — — — — — 80 2 Residential construction — — — — 1 — — — Residential first mortgage 458 9 407 10 629 45 636 15 Residential junior mortgage 263 5 313 7 65 4 197 5 Retail & other — — 8 — — — — — Nonaccrual loans $ 5,076 100 % $ 4,162 100 % $ 1,409 100 % $ 4,062 100 % Percent of nonaccrual loans 55 % 45 % 26 % 74 %
Schedule of past due loans by portfolio segment	The following tables present past due loans by portfolio segment. September 30, 2019 (in thousands) 30-89 Days Past Due (accruing) 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 215 $ 2,279 $ 761,248 $ 763,742 Owner-occupied CRE — 2,302 454,206 456,508 AG production — 1,251 34,799 36,050 AG real estate — 846 57,745 58,591 CRE investment — 1,111 335,331 336,442 Construction & land development — — 61,810 61,810 Residential construction — — 41,496 41,496 Residential first mortgage 319 865 342,216 343,400 Residential junior mortgage 283 576 115,320 116,179 Retail & other 124 8 28,581 28,713 Total loans $ 941 $ 9,238 $ 2,232,752 $ 2,242,931 Percent of total loans — % 0.4 % 99.6 % 100.0 % December 31, 2018 (in thousands) 30-89 Days Past Due (accruing) 90 Days & Over or nonaccrual Current Total Commercial & industrial $ — $ 2,816 $ 682,104 $ 684,920 Owner-occupied CRE 557 673 440,123 441,353 AG production 19 — 35,606 35,625 AG real estate 35 164 53,245 53,444 CRE investment 180 210 343,262 343,652 Construction & land development — 80 80,519 80,599 Residential construction — 1 30,925 30,926 Residential first mortgage 758 1,265 355,818 357,841 Residential junior mortgage 12 262 111,054 111,328 Retail & other 10 — 26,483 26,493 Total loans $ 1,571 $ 5,471 $ 2,159,139 $ 2,166,181 Percent of total loans 0.1 % 0.2 % 99.7 % 100.0 %
Schedule of loans by loan grade	The following tables present total loans by risk categories. September 30, 2019 (in thousands) Grades 1- 4 Grade 5 Grade 6 Grade 7 Grade 8 Grade 9 Total Commercial & industrial $ 725,484 $ 22,299 $ 2,076 $ 13,883 $ — $ — $ 763,742 Owner-occupied CRE 428,332 15,110 963 12,103 — — 456,508 AG production 27,350 4,044 1,669 2,987 — — 36,050 AG real estate 48,740 4,077 2,344 3,430 — — 58,591 CRE investment 332,078 2,345 908 1,111 — — 336,442 Construction & land development 61,794 — 16 — — — 61,810 Residential construction 41,496 — — — — — 41,496 Residential first mortgage 338,627 1,664 1,193 1,916 — — 343,400 Residential junior mortgage 115,595 — — 584 — — 116,179 Retail & other 28,705 — — 8 — — 28,713 Total loans $ 2,148,201 $ 49,539 $ 9,169 $ 36,022 $ — $ — $ 2,242,931 Percent of total 95.8 % 2.2 % 0.4 % 1.6 % — — 100.0 % December 31, 2018 (in thousands) Grades 1- 4 Grade 5 Grade 6 Grade 7 Grade 8 Grade 9 Total Commercial & industrial $ 649,475 $ 16,145 $ 6,178 $ 13,122 $ — $ — $ 684,920 Owner-occupied CRE 405,198 22,776 6,569 6,810 — — 441,353 AG production 29,363 3,302 2,351 609 — — 35,625 AG real estate 46,248 3,246 2,983 967 — — 53,444 CRE investment 334,080 6,792 — 2,780 — — 343,652 Construction & land development 75,365 5,138 16 80 — — 80,599 Residential construction 30,926 — — — — — 30,926 Residential first mortgage 353,239 1,406 510 2,686 — — 357,841 Residential junior mortgage 111,037 17 — 274 — — 111,328 Retail & other 26,493 — — — — — 26,493 Total loans $ 2,061,424 $ 58,822 $ 18,607 $ 27,328 $ — $ — $ 2,166,181 Percent of total 95.1 % 2.7 % 0.9 % 1.3 % — — 100.0 %
Schedule of impaired loans and further breakdown summarized by originated and acquired	The following tables present impaired loans. Total Impaired Loans – September 30, 2019 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Commercial & industrial $ 2,143 $ 4,271 $ 308 $ 2,807 $ 739 Owner-occupied CRE 2,552 2,930 — 2,742 170 AG production 1,251 1,263 119 1,295 12 AG real estate 1,089 1,091 — 1,098 2 CRE investment 2,483 2,490 — 2,524 8 Construction & land development 427 427 — 480 — Residential construction — — — — — Residential first mortgage 2,560 2,785 — 2,611 97 Residential junior mortgage 221 231 — 225 2 Retail & other 12 15 — 12 3 Total $ 12,738 $ 15,503 $ 427 $ 13,794 $ 1,033 Originated impaired loans $ 4,487 $ 4,707 $ 427 $ 4,649 $ 176 Acquired impaired loans 8,251 10,796 — 9,145 857 Total $ 12,738 $ 15,503 $ 427 $ 13,794 $ 1,033 Total Impaired Loans – December 31, 2018 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Commercial & industrial $ 2,927 $ 6,736 $ — $ 4,041 $ 660 Owner-occupied CRE 1,506 1,833 — 1,659 137 AG production — — — — — AG real estate 222 281 — 238 26 CRE investment 1,686 2,484 — 1,606 163 Construction & land development 603 1,506 — 603 21 Residential construction — — — — — Residential first mortgage 2,750 2,907 — 2,478 176 Residential junior mortgage 233 262 — 62 15 Retail & other 12 12 — 12 1 Total $ 9,939 $ 16,021 $ — $ 10,699 $ 1,199 Originated impaired loans $ 548 $ 548 $ — $ 899 $ 154 Acquired impaired loans 9,391 15,473 — 9,800 1,045 Total $ 9,939 $ 16,021 $ — $ 10,699 $ 1,199
Schedule of non accretable discount	Nonaccretable discount on purchased credit impaired loans: Nine Months Ended Year Ended (in thousands) September 30, 2019 September 30, 2018 December 31, 2018 Balance at beginning of period $ 6,408 $ 9,471 $ 9,471 Accretion to loan interest income (3,293 ) (1,872 ) (1,976 ) Transferred to accretable — (513 ) (990 ) Disposals of loans (660 ) (97 ) (97 ) Balance at end of period $ 2,455 $ 6,989 $ 6,408

Goodwill and Other Intangible_2

Goodwill and Other Intangibles and Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill and intangible assets included in other assets	A summary of goodwill and other intangibles was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Goodwill $ 107,366 $ 107,366 Core deposit intangibles 10,006 12,562 Customer list intangibles 3,999 4,379 Other intangibles 14,005 16,941 Goodwill and other intangibles, net $ 121,371 $ 124,307
Schedule of other intangible assets	Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Core deposit intangibles: Gross carrying amount $ 29,015 $ 29,015 Accumulated amortization (19,009 ) (16,453 ) Net book value $ 10,006 $ 12,562 Additions during the period $ — $ — Amortization during the period $ 2,556 $ 3,915 Customer list intangibles: Gross carrying amount $ 5,523 $ 5,523 Accumulated amortization (1,524 ) (1,144 ) Net book value $ 3,999 $ 4,379 Additions during the period $ — $ 290 Amortization during the period $ 380 $ 474
Schedule of mortgage servicing rights	A summary of the changes in the mortgage servicing rights asset was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2019 December 31, 2018 Mortgage servicing rights ("MSR") asset: MSR asset at beginning of year $ 3,749 $ 3,187 Capitalized MSR 1,807 1,203 Amortization during the period (611 ) (641 ) MSR asset at end of period $ 4,945 $ 3,749 Fair value of MSR asset at end of period $ 6,960 $ 6,347 Residential mortgage loans serviced for others $ 721,569 $ 603,446 Net book value of MSR asset to loans serviced for others 0.69 % 0.62 %
Schedule of estimated future amortization expense for amortizing intangible assets and the MSR asset	The following table shows the estimated future amortization expense for amortizing intangible assets and the MSR asset. The projections are based on existing asset balances, the current interest rate environment and prepayment speeds as of September 30, 2019 . The actual amortization expense the Company recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements and events or circumstances that indicate the carrying amount of an asset may not be recoverable. (in thousands) Core deposit intangibles Customer list intangibles MSR asset Year ending December 31, 2019 (remaining three months) $ 781 $ 127 $ 224 2020 2,657 507 879 2021 2,167 507 730 2022 1,735 507 730 2023 1,273 483 658 2024 841 449 400 Thereafter 552 1,419 1,324 Total $ 10,006 $ 3,999 $ 4,945

Short and Long-Term Borrowings

Short and Long-Term Borrowings (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of components of long-term borrowings	The components of long-term borrowings (borrowing with an original maturity greater than one year) were as follows. (in thousands) September 30, 2019 December 31, 2018 FHLB advances $ 15,056 $ 35,252 Junior subordinated debentures 30,455 30,096 Subordinated notes 11,984 11,957 Total long-term borrowings $ 57,495 $ 77,305 Percent of fixed rate long-term borrowings 58 % 69 % Percent of floating rate long-term borrowings 42 % 31 %
Schedule of junior subordinated debentures	Junior Subordinated Debentures 9/30/2019 9/30/2019 12/31/18 (in thousands) Maturity Date Par Unamortized Discount Carrying Value Carrying Value 2004 Nicolet Bankshares Statutory Trust (1) 7/15/2034 $ 6,186 $ — $ 6,186 $ 6,186 2005 Mid-Wisconsin Financial Services, Inc. (2) 12/15/2035 10,310 (3,222 ) 7,088 6,939 2006 Baylake Corp. (3) 9/30/2036 16,598 (3,942 ) 12,656 12,478 2004 First Menasha Bancshares, Inc. (4) 3/17/2034 5,155 (630 ) 4,525 4,493 Total $ 38,249 $ (7,794 ) $ 30,455 $ 30,096 (1) The interest rate is 8.00% fixed. (2) The debentures, assumed in April 2013 as the result of an acquisition, have a floating rate of the three-month LIBOR plus 1.43% , adjusted quarterly. The interest rates were 3.55% and 4.22% as of September 30, 2019 and December 31, 2018 , respectively. (3) The debentures, assumed in April 2016 as a result of an acquisition, have a floating rate of the three-month LIBOR plus 1.35% , adjusted quarterly. The interest rates were 3.45% and 4.15% as of September 30, 2019 and December 31, 2018 , respectively. (4) The debentures, assumed in April 2017 as the result of an acquisition, have a floating rate of the three-month LIBOR plus 2.79% , adjusted quarterly. The interest rates were 4.93% and 5.58% as of September 30, 2019 and December 31, 2018 , respectively.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Recurring Basis: Total Level 1 Level 2 Level 3 September 30, 2019 U.S. government agency securities $ 16,490 $ — $ 16,490 $ — State, county and municipals 147,786 — 147,786 — Mortgage-backed securities 171,877 — 171,877 — Corporate debt securities 83,147 — 80,317 2,830 Securities AFS $ 419,300 $ — $ 416,470 $ 2,830 Other investments (equity securities) $ 4,080 $ 4,080 $ — $ — December 31, 2018 U.S. government agency securities $ 21,649 $ — $ 21,649 $ — State, county and municipals 160,526 — 160,460 66 Mortgage-backed securities 131,644 — 131,644 — Corporate debt securities 86,325 — 77,901 8,424 Securities AFS $ 400,144 $ — $ 391,654 $ 8,490 Other investments (equity securities) $ 2,650 $ 2,650 $ — $ —
Schedule of changes in the Level 3 securities AFS measured at fair value on a recurring basis	The following table presents the changes in the Level 3 securities AFS measured at fair value on a recurring basis. (in thousands) Nine Months Ended Year Ended Level 3 Fair Value Measurements: September 30, 2019 December 31, 2018 Balance at beginning of year $ 8,490 $ 9,151 Paydowns/Sales/Settlements (5,660 ) (661 ) Balance at end of period $ 2,830 $ 8,490
Schedule of assets measured at fair value on a nonrecurring basis	The following table presents the Company’s assets measured at fair value on a nonrecurring basis, aggregated by level in the fair value hierarchy within which those measurements fall. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Nonrecurring Basis: Total Level 1 Level 2 Level 3 September 30, 2019 Impaired loans $ 12,311 $ — $ — $ 12,311 Other real estate owned (“OREO”) 1,325 — — 1,325 MSR asset 6,960 — — 6,960 December 31, 2018 Impaired loans $ 9,939 $ — $ — $ 9,939 OREO 420 — — 420 MSR asset 6,347 — — 6,347
Schedule of estimated fair values of financial instruments	The carrying amounts and estimated fair values of the Company’s financial instruments are shown below. September 30, 2019 (in thousands) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 143,969 $ 143,969 $ 143,969 $ — $ — Certificates of deposit in other banks 5,395 5,390 — 5,390 — Securities AFS 419,300 419,300 — 416,470 2,830 Other investments, including equity securities 20,697 20,697 4,080 13,259 3,358 Loans held for sale 10,564 10,710 — 10,710 — Loans, net 2,229,311 2,244,410 — — 2,244,410 BOLI 71,796 71,796 71,796 — — MSR asset 4,945 6,960 — — 6,960 Financial liabilities: Deposits $ 2,584,447 $ 2,584,662 $ — $ — $ 2,584,662 Long-term borrowings 57,495 56,679 — 15,135 41,544 December 31, 2018 (in thousands) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 249,526 $ 249,526 $ 249,526 $ — $ — Certificates of deposit in other banks 993 993 — 993 — Securities AFS 400,144 400,144 — 391,654 8,490 Other investments, including equity securities 17,997 17,997 2,650 13,189 2,158 Loans held for sale 1,639 1,662 — 1,662 — Loans, net 2,153,028 2,139,322 — — 2,139,322 BOLI 66,310 66,310 66,310 — — MSR asset 3,749 6,347 — — 6,347 Financial liabilities: Deposits $ 2,614,138 $ 2,614,995 $ — $ — $ 2,614,995 Long-term borrowings 77,305 75,923 — 34,907 41,016

Operating Leases (Tables)

Operating Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Cost of Operating Leases	A summary of net lease cost and selected other information related to operating leases was as follows. Nine Months Ended ($ in thousands) September 30, 2019 Net lease cost: Operating lease cost $ 737 Variable lease cost 179 Net lease cost $ 916 Selected other operating lease information: Weighted average remaining lease term (years) 5 Weighted average discount rate 2.5 %
Schedule of Operating Lease Maturities	The following table summarizes the maturity of remaining lease liabilities. (in thousands) Year ending December 31, 2019 (remaining three months) $ 951 2020 1,037 2021 911 2022 851 2023 607 2024 499 Thereafter 16 Total future minimum lease payments 4,872 Less: amount representing interest (122 ) Present value of net future minimum lease payments $ 4,750

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Accounting Policies [Abstract]
Lease liability	$ 4,750	$ 5,000
Right-of-use asset		$ 5,000

Pending Acquisition (Details)

Pending Acquisition (Details) $ in Thousands	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Assets	$ 3,105,671		$ 3,096,535
Deposits	2,584,447		2,614,138
Equity	428,742	$ 412,148	$ 387,352	$ 377,903	$ 371,285	$ 364,879
Choice Bancorp Inc.
Business Acquisition [Line Items]
Assets	436,000
Loans	352,000
Deposits	306,000
Equity	$ 41,000
Percentage of assets represented by acquiree	0.14

Earnings per Common Share - Nar

Earnings per Common Share - Narrative (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Shares excluded from calculation of earnings per common share (in shares)	0.1	0.1	0.1	0.1

Earnings per Common Share - Cal

Earnings per Common Share - Calculations for basic and diluted earnings (loss) per common share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to Nicolet Bankshares, Inc.	$ 13,530	$ 10,859	$ 42,346	$ 30,173
Weighted average common shares outstanding (in shares)	9,346,814	9,633,158	9,393,795	9,678,726
Effect of dilutive common stock awards (in shares)	350,000	316,000	313,000	325,000
Diluted weighted average common shares outstanding (in shares)	9,696,850	9,949,295	9,706,795	10,004,316
Basic earnings per common share (in dollars per share)	$ 1.45	$ 1.13	$ 4.51	$ 3.12
Diluted earnings per common share (in dollars per share)	$ 1.40	$ 1.09	$ 4.36	$ 3.02

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Feb. 28, 2019	Jan. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share awards authorized (in shares)				3,000,000
Number of shares were available for grant under two plans (in shares)	1,600,000
Shares surrendered to the Company (in shares)	70,068
Numbers of shares surrendered (in shares)	1,637
Stock-based employee compensation	$ 3.4	$ 3.4
Unrecognized compensation cost	$ 9.9
Remaining vesting period over which cost expected to be recognized	3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 6.9	1.8
Tax benefit for impact of share based compensation	$ 1	$ 0.2
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted to directors (in shares)	4,257		3,510
Long Term Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share awards authorized (in shares)					1,500,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation	$ 0.3		$ 0.2

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted average assumptions (Details) - Stock Incentive Plan - Stock Options - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	25.00%	25.00%
Risk-free interest rate	2.37%	2.48%
Expected average life (in years)	7 years	7 years
Weighted average per share fair value of options (in usd per share)	$ 19.23	$ 17.60

Stock-Based Compensation - Acti

Stock-Based Compensation - Activity of stock incentive plans for options (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)$ / sharesshares
Option Shares Outstanding
Forfeited (in shares)	(70,068)
Stock Incentive Plan | Stock Options
Option Shares Outstanding
Beginning balance outstanding (in shares)	1,581,699
Granted (in shares)	15,000
Exercise of stock options (in shares)	(185,328)
Forfeited (in shares)	(3,538)
Ending balance outstanding (in shares)	1,407,833
Exercisable (in shares)	644,033
Weighted Average Exercise Price
Beginning balance outstanding (in usd per share) | $ / shares	$ 40.77
Granted (in usd per share) | $ / shares	59.55
Exercise of stock options (in usd per share) | $ / shares	23.64
Forfeited (in usd per share) | $ / shares	27.43
Ending balance outstanding (in usd per share) | $ / shares	43.25
Exercisable (in usd per share) | $ / shares	$ 39.28
Weighted average remaining life outstanding (in years)	6 years 11 months 26 days
Weighted average remaining life exercisable (in years)	6 years 6 months
Aggregate intrinsic value outstanding | $	$ 32,829
Aggregate intrinsic value exercisable | $	$ 17,577

Stock-Based Compensation - Ac_2

Stock-Based Compensation - Activity of restricted stock awards (Details) - Restricted Stock - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Weighted-Average Grant Date Fair Value
Beginning balance outstanding (in usd per share)	$ 39.37
Granted (in usd per share)	61.96
Vested (in usd per share)	45.05
Forfeited (in usd per share)	16.50
Ending balance outstanding (in usd per share)	$ 41.50	$ 39.37
Restricted Shares Outstanding
Beginning balance outstanding (in shares)	29,512
Granted (in shares)	4,257	3,510
Vested (in shares)	(9,672)
Forfeited (in shares)	(408)
Ending balance outstanding (in shares)	23,689	29,512

Securities Available for Sale -

Securities Available for Sale - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Other-than-temporary impairment losses charged to earnings	$ 0	$ 0

Securities Available for Sale_2

Securities Available for Sale - Amortized costs and fair values of debt securities available for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 412,894	$ 407,871
Gross Unrealized Gains	7,473	470
Gross Unrealized Losses	1,067	8,197
Fair Value	419,300	400,144
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,697	22,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	207	818
Fair Value	16,490	21,649
State, county and municipals
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	147,186	163,702
Gross Unrealized Gains	798	76
Gross Unrealized Losses	198	3,252
Fair Value	147,786	160,526
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	169,262	134,350
Gross Unrealized Gains	3,267	328
Gross Unrealized Losses	652	3,034
Fair Value	171,877	131,644
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,749	87,352
Gross Unrealized Gains	3,408	66
Gross Unrealized Losses	10	1,093
Fair Value	$ 83,147	$ 86,325

Securities Available for Sale_3

Securities Available for Sale - Gross unrealized losses and the related fair value of securities available for sale (Details) $ in Thousands	Sep. 30, 2019USD ($)Security	Dec. 31, 2018USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 84,571	$ 88,296
Less than 12 months, unrealized losses	275	907
12 months or more, fair value	65,643	251,570
12 months or more, unrealized losses	792	7,290
Total, fair value	150,214	339,866
Total, unrealized losses	$ 1,067	$ 8,197
Total, number of securities | Security	293	680
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 0	$ 0
Less than 12 months, unrealized losses	0	0
12 months or more, fair value	16,490	21,649
12 months or more, unrealized losses	207	818
Total, fair value	16,490	21,649
Total, unrealized losses	$ 207	$ 818
Total, number of securities | Security	3	3
State, county and municipals
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 44,012	$ 16,136
Less than 12 months, unrealized losses	138	98
12 months or more, fair value	8,370	130,975
12 months or more, unrealized losses	60	3,154
Total, fair value	52,382	147,111
Total, unrealized losses	$ 198	$ 3,252
Total, number of securities | Security	139	440
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 38,515	$ 20,568
Less than 12 months, unrealized losses	127	132
12 months or more, fair value	40,783	89,189
12 months or more, unrealized losses	525	2,902
Total, fair value	79,298	109,757
Total, unrealized losses	$ 652	$ 3,034
Total, number of securities | Security	150	204
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 2,044	$ 51,592
Less than 12 months, unrealized losses	10	677
12 months or more, fair value	0	9,757
12 months or more, unrealized losses	0	416
Total, fair value	2,044	61,349
Total, unrealized losses	$ 10	$ 1,093
Total, number of securities | Security	1	33

Securities Available for Sale_4

Securities Available for Sale - Amortized cost and fair values of securities available for sale at by contractual maturity (Details) $ in Thousands	Sep. 30, 2019USD ($)
Amortized Cost
Due in less than one year	$ 18,762
Due in one year through five years	184,588
Due after five years through ten years	33,877
Due after ten years	6,405
Single maturity date, amortized cost	243,632
Amortized cost	412,894
Fair Value
Due in less than one year	18,770
Due in one year through five years	187,185
Due after five years through ten years	34,314
Due after ten years	7,154
Single maturity date, fair value	247,423
Fair value	419,300
Mortgage-backed securities
Amortized Cost
Amortized cost	169,262
Fair Value
Fair value	$ 171,877

Securities Available for Sale_5

Securities Available for Sale - Proceeds from the sale of securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Gross gains	$ 152	$ 0
Gross losses	(120)	0
Gains (losses) on sales of securities AFS, net	32	0
Proceeds from sales of securities AFS	$ 13,240	$ 0

Loans, Allowance for Loan Los_3

Loans, Allowance for Loan Losses, and Credit Quality - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)Loan	Dec. 31, 2018USD ($)Loan
Loans and Leases Receivable Disclosure [Line Items]
Remaining impaired loans	$ 12,738,000	$ 9,939,000
Number of loans classified as troubled debt | Loan	5	4
Troubled debt restructuring current outstanding balance	$ 1,200,000	$ 600,000
Pre-modification balance	1,400,000	2,700,000
Acquired
Loans and Leases Receivable Disclosure [Line Items]
PCI loans acquired fair value	43,600,000
Nonaccretable mark	34,400,000
Accretable mark	0
Remaining impaired loans	8,251,000	$ 9,391,000
Current
Loans and Leases Receivable Disclosure [Line Items]
Troubled debt restructuring current outstanding balance	$ 500,000

Loans, Allowance for Loan Los_4

Loans, Allowance for Loan Losses, and Credit Quality - Summary of loan composition (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 2,242,931	$ 2,166,181
Less allowance for loan losses (“ALLL”)	13,620	13,153	$ 12,992	$ 12,653
Loans, net	$ 2,229,311	$ 2,153,028
Percent of total	100.00%	100.00%
Allowance for loan losses to loans	0.61%	0.61%
Percentage of loans originated	74.00%	69.00%
Percentage of loans acquired	26.00%	31.00%
Retail & other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 28,713	$ 26,493
Less allowance for loan losses (“ALLL”)	314	304		225
Loans, net	$ 28,399	$ 26,189
Percent of total	1.00%	1.00%
Commercial portfolio segment | Commercial & industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 763,742	$ 684,920
Less allowance for loan losses (“ALLL”)	5,658	5,271		4,934
Loans, net	$ 758,084	$ 679,649
Percent of total	34.00%	32.00%
Commercial portfolio segment | Owner-occupied CRE
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 456,508	$ 441,353
Less allowance for loan losses (“ALLL”)	2,779	2,847		2,607
Loans, net	$ 453,729	$ 438,506
Percent of total	20.00%	20.00%
Commercial portfolio segment | AG production
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 36,050	$ 35,625
Less allowance for loan losses (“ALLL”)	206	121		129
Loans, net	$ 35,844	$ 35,504
Percent of total	2.00%	2.00%
Commercial real estate portfolio segment | AG real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 58,591	$ 53,444
Less allowance for loan losses (“ALLL”)	347	301		296
Loans, net	$ 58,244	$ 53,143
Percent of total	3.00%	2.00%
Commercial real estate portfolio segment | CRE investment
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 336,442	$ 343,652
Less allowance for loan losses (“ALLL”)	1,502	1,470		1,388
Loans, net	$ 334,940	$ 342,182
Percent of total	15.00%	16.00%
Commercial real estate portfolio segment | Construction & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 61,810	$ 80,599
Less allowance for loan losses (“ALLL”)	370	510		726
Loans, net	$ 61,440	$ 80,089
Percent of total	3.00%	4.00%
Residential | Residential construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 41,496	$ 30,926
Less allowance for loan losses (“ALLL”)	342	211		251
Loans, net	$ 41,154	$ 30,715
Percent of total	2.00%	1.00%
Residential | Residential first mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 343,400	$ 357,841
Less allowance for loan losses (“ALLL”)	1,607	1,646		1,609
Loans, net	$ 341,793	$ 356,195
Percent of total	15.00%	17.00%
Residential | Residential junior mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 116,179	$ 111,328
Less allowance for loan losses (“ALLL”)	495	472		488
Loans, net	$ 115,684	$ 110,856
Percent of total	5.00%	5.00%
Originated
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 1,650,693	$ 1,485,165
Less allowance for loan losses (“ALLL”)	12,064	11,448		10,542
Loans, net	$ 1,638,629	$ 1,473,717
Percent of total	100.00%	100.00%
Allowance for loan losses to loans	0.73%	0.77%
Originated | Retail & other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 27,232	$ 23,809
Less allowance for loan losses (“ALLL”)	293	281		200
Loans, net	$ 26,939	$ 23,528
Percent of total	2.00%	2.00%
Originated | Commercial portfolio segment | Commercial & industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 660,040	$ 568,100
Less allowance for loan losses (“ALLL”)	5,109	4,683		4,192
Loans, net	$ 654,931	$ 563,417
Percent of total	40.00%	38.00%
Originated | Commercial portfolio segment | Owner-occupied CRE
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 321,323	$ 283,531
Less allowance for loan losses (“ALLL”)	2,411	2,439		2,115
Loans, net	$ 318,912	$ 281,092
Percent of total	19.00%	19.00%
Originated | Commercial portfolio segment | AG production
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 11,450	$ 11,113
Less allowance for loan losses (“ALLL”)	194	110		112
Loans, net	$ 11,256	$ 11,003
Percent of total	1.00%	1.00%
Originated | Commercial real estate portfolio segment | AG real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 38,616	$ 31,374
Less allowance for loan losses (“ALLL”)	300	255		235
Loans, net	$ 38,316	$ 31,119
Percent of total	2.00%	2.00%
Originated | Commercial real estate portfolio segment | CRE investment
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 180,427	$ 171,087
Less allowance for loan losses (“ALLL”)	1,298	1,230		1,154
Loans, net	$ 179,129	$ 169,857
Percent of total	11.00%	12.00%
Originated | Commercial real estate portfolio segment | Construction & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 52,806	$ 66,478
Less allowance for loan losses (“ALLL”)	320	431		628
Loans, net	$ 52,486	$ 66,047
Percent of total	3.00%	4.00%
Originated | Residential | Residential construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 41,246	$ 30,926
Less allowance for loan losses (“ALLL”)	308	211		200
Loans, net	$ 40,938	$ 30,715
Percent of total	3.00%	2.00%
Originated | Residential | Residential first mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 228,312	$ 220,368
Less allowance for loan losses (“ALLL”)	1,394	1,400		1,297
Loans, net	$ 226,918	$ 218,968
Percent of total	14.00%	15.00%
Originated | Residential | Residential junior mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 89,241	$ 78,379
Less allowance for loan losses (“ALLL”)	437	408		409
Loans, net	$ 88,804	$ 77,971
Percent of total	5.00%	5.00%
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 592,238	$ 681,016
Less allowance for loan losses (“ALLL”)	1,556	1,705		2,111
Loans, net	$ 590,682	$ 679,311
Percent of total	100.00%	100.00%
Allowance for loan losses to loans	0.26%	0.25%
Acquired | Retail & other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 1,481	$ 2,684
Less allowance for loan losses (“ALLL”)	21	23		25
Loans, net	$ 1,460	$ 2,661
Percent of total	0.00%	1.00%
Acquired | Commercial portfolio segment | Commercial & industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 103,702	$ 116,820
Less allowance for loan losses (“ALLL”)	549	588		742
Loans, net	$ 103,153	$ 116,232
Percent of total	18.00%	17.00%
Acquired | Commercial portfolio segment | Owner-occupied CRE
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 135,185	$ 157,822
Less allowance for loan losses (“ALLL”)	368	408		492
Loans, net	$ 134,817	$ 157,414
Percent of total	23.00%	23.00%
Acquired | Commercial portfolio segment | AG production
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 24,600	$ 24,512
Less allowance for loan losses (“ALLL”)	12	11		17
Loans, net	$ 24,588	$ 24,501
Percent of total	4.00%	4.00%
Acquired | Commercial real estate portfolio segment | AG real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 19,975	$ 22,070
Less allowance for loan losses (“ALLL”)	47	46		61
Loans, net	$ 19,928	$ 22,024
Percent of total	3.00%	3.00%
Acquired | Commercial real estate portfolio segment | CRE investment
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 156,015	$ 172,565
Less allowance for loan losses (“ALLL”)	204	240		234
Loans, net	$ 155,811	$ 172,325
Percent of total	26.00%	25.00%
Acquired | Commercial real estate portfolio segment | Construction & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 9,004	$ 14,121
Less allowance for loan losses (“ALLL”)	50	79		98
Loans, net	$ 8,954	$ 14,042
Percent of total	2.00%	2.00%
Acquired | Residential | Residential construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 250	$ 0
Less allowance for loan losses (“ALLL”)	34	0		51
Loans, net	$ 216	$ 0
Percent of total	0.00%	0.00%
Acquired | Residential | Residential first mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 115,088	$ 137,473
Less allowance for loan losses (“ALLL”)	213	246		312
Loans, net	$ 114,875	$ 137,227
Percent of total	19.00%	20.00%
Acquired | Residential | Residential junior mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 26,938	$ 32,949
Less allowance for loan losses (“ALLL”)	58	64		$ 79
Loans, net	$ 26,880	$ 32,885
Percent of total	5.00%	5.00%

Loans, Allowance for Loan Los_5

Loans, Allowance for Loan Losses, and Credit Quality - Summary of allowance for loan losses (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 13,153	$ 12,653	$ 12,653
Provision for loan losses	900	1,360	1,600
Charge-offs	(629)	(1,110)	(1,213)
Recoveries	196	89	113
Net (charge-offs) recoveries	(433)	(1,021)	(1,100)
Ending balance	$ 13,620	$ 12,992	$ 13,153

Loans, Allowance for Loan Los_6

Loans, Allowance for Loan Losses, and Credit Quality - Summary of changes in ALLL by portfolio segment for periods - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Allowance for Loan Losses (ALLL):
Beginning balance	$ 13,153	$ 12,653	$ 12,653
Provision	900	1,360	1,600
Charge-offs	(629)	(1,110)	(1,213)
Recoveries	196	89	113
Net (charge-offs) recoveries	(433)	(1,021)	(1,100)
Ending balance	$ 13,620	12,992	$ 13,153
As percent of ALLL	100.00%		100.00%
ALLL:
Individually evaluated	$ 427		$ 0
Collectively evaluated	13,193		13,153
Loans:
Individually evaluated	12,738		9,939
Collectively evaluated	2,230,193		2,156,242
Total	2,242,931		2,166,181
Net loans	2,229,311		2,153,028
Retail & other
Allowance for Loan Losses (ALLL):
Beginning balance	304	225	225
Provision	225		267
Charge-offs	(251)		(204)
Recoveries	36		16
Net (charge-offs) recoveries	(215)		(188)
Ending balance	$ 314		$ 304
As percent of ALLL	2.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	314		304
Loans:
Individually evaluated	12		12
Collectively evaluated	28,701		26,481
Total	28,713		26,493
Net loans	28,399		26,189
Commercial portfolio segment | Commercial & industrial
Allowance for Loan Losses (ALLL):
Beginning balance	5,271	4,934	4,934
Provision	356		1,107
Charge-offs	(59)		(813)
Recoveries	90		43
Net (charge-offs) recoveries	31		(770)
Ending balance	$ 5,658		$ 5,271
As percent of ALLL	42.00%		40.00%
ALLL:
Individually evaluated	$ 308		$ 0
Collectively evaluated	5,350		5,271
Loans:
Individually evaluated	2,143		2,927
Collectively evaluated	761,599		681,993
Total	763,742		684,920
Net loans	758,084		679,649
Commercial portfolio segment | Owner-occupied CRE
Allowance for Loan Losses (ALLL):
Beginning balance	2,847	2,607	2,607
Provision	(57)		300
Charge-offs	(13)		(74)
Recoveries	2		14
Net (charge-offs) recoveries	(11)		(60)
Ending balance	$ 2,779		$ 2,847
As percent of ALLL	20.00%		22.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	2,779		2,847
Loans:
Individually evaluated	2,552		1,506
Collectively evaluated	453,956		439,847
Total	456,508		441,353
Net loans	453,729		438,506
Commercial portfolio segment | AG production
Allowance for Loan Losses (ALLL):
Beginning balance	121	129	129
Provision	85		(8)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 206		$ 121
As percent of ALLL	1.00%		1.00%
ALLL:
Individually evaluated	$ 119		$ 0
Collectively evaluated	87		121
Loans:
Individually evaluated	1,251		0
Collectively evaluated	34,799		35,625
Total	36,050		35,625
Net loans	35,844		35,504
Commercial real estate portfolio segment | AG real estate
Allowance for Loan Losses (ALLL):
Beginning balance	301	296	296
Provision	46		5
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 347		$ 301
As percent of ALLL	3.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	347		301
Loans:
Individually evaluated	1,089		222
Collectively evaluated	57,502		53,222
Total	58,591		53,444
Net loans	58,244		53,143
Commercial real estate portfolio segment | CRE investment
Allowance for Loan Losses (ALLL):
Beginning balance	1,470	1,388	1,388
Provision	32		119
Charge-offs	0		(37)
Recoveries	0		0
Net (charge-offs) recoveries	0		(37)
Ending balance	$ 1,502		$ 1,470
As percent of ALLL	11.00%		11.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	1,502		1,470
Loans:
Individually evaluated	2,483		1,686
Collectively evaluated	333,959		341,966
Total	336,442		343,652
Net loans	334,940		342,182
Commercial real estate portfolio segment | Construction & land development
Allowance for Loan Losses (ALLL):
Beginning balance	510	726	726
Provision	(140)		(216)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 370		$ 510
As percent of ALLL	3.00%		4.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	370		510
Loans:
Individually evaluated	427		603
Collectively evaluated	61,383		79,996
Total	61,810		80,599
Net loans	61,440		80,089
Residential | Residential first mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	1,646	1,609	1,609
Provision	(75)		117
Charge-offs	0		(85)
Recoveries	36		5
Net (charge-offs) recoveries	36		(80)
Ending balance	$ 1,607		$ 1,646
As percent of ALLL	12.00%		12.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	1,607		1,646
Loans:
Individually evaluated	2,560		2,750
Collectively evaluated	340,840		355,091
Total	343,400		357,841
Net loans	341,793		356,195
Residential | Residential junior mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	472	488	488
Provision	71		(51)
Charge-offs	(80)		0
Recoveries	32		35
Net (charge-offs) recoveries	(48)		35
Ending balance	$ 495		$ 472
As percent of ALLL	4.00%		4.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	495		472
Loans:
Individually evaluated	221		233
Collectively evaluated	115,958		111,095
Total	116,179		111,328
Net loans	115,684		110,856
Residential | Residential construction
Allowance for Loan Losses (ALLL):
Beginning balance	211	251	251
Provision	357		(40)
Charge-offs	(226)		0
Recoveries	0		0
Net (charge-offs) recoveries	(226)		0
Ending balance	$ 342		$ 211
As percent of ALLL	2.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	342		211
Loans:
Individually evaluated	0		0
Collectively evaluated	41,496		30,926
Total	41,496		30,926
Net loans	41,154		30,715
Originated
Allowance for Loan Losses (ALLL):
Beginning balance	11,448	10,542	10,542
Provision	994		2,014
Charge-offs	(569)		(1,200)
Recoveries	191		92
Net (charge-offs) recoveries	(378)		(1,108)
Ending balance	$ 12,064		$ 11,448
As percent of ALLL	100.00%		100.00%
ALLL:
Individually evaluated	$ 427		$ 0
Collectively evaluated	11,637		11,448
Loans:
Individually evaluated	4,487		548
Collectively evaluated	1,646,206		1,484,617
Total	1,650,693		1,485,165
Net loans	1,638,629		1,473,717
Originated | Retail & other
Allowance for Loan Losses (ALLL):
Beginning balance	281	200	200
Provision	227		266
Charge-offs	(251)		(201)
Recoveries	36		16
Net (charge-offs) recoveries	(215)		(185)
Ending balance	$ 293		$ 281
As percent of ALLL	2.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	293		281
Loans:
Individually evaluated	0		0
Collectively evaluated	27,232		23,809
Total	27,232		23,809
Net loans	26,939		23,528
Originated | Commercial portfolio segment | Commercial & industrial
Allowance for Loan Losses (ALLL):
Beginning balance	4,683	4,192	4,192
Provision	395		1,262
Charge-offs	(59)		(813)
Recoveries	90		42
Net (charge-offs) recoveries	31		(771)
Ending balance	$ 5,109		$ 4,683
As percent of ALLL	42.00%		41.00%
ALLL:
Individually evaluated	$ 308		$ 0
Collectively evaluated	4,801		4,683
Loans:
Individually evaluated	722		227
Collectively evaluated	659,318		567,873
Total	660,040		568,100
Net loans	654,931		563,417
Originated | Commercial portfolio segment | Owner-occupied CRE
Allowance for Loan Losses (ALLL):
Beginning balance	2,439	2,115	2,115
Provision	(17)		385
Charge-offs	(13)		(64)
Recoveries	2		3
Net (charge-offs) recoveries	(11)		(61)
Ending balance	$ 2,411		$ 2,439
As percent of ALLL	20.00%		21.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	2,411		2,439
Loans:
Individually evaluated	1,792		321
Collectively evaluated	319,531		283,210
Total	321,323		283,531
Net loans	318,912		281,092
Originated | Commercial portfolio segment | AG production
Allowance for Loan Losses (ALLL):
Beginning balance	110	112	112
Provision	84		(2)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 194		$ 110
As percent of ALLL	1.00%		1.00%
ALLL:
Individually evaluated	$ 119		$ 0
Collectively evaluated	75		110
Loans:
Individually evaluated	1,095		0
Collectively evaluated	10,355		11,113
Total	11,450		11,113
Net loans	11,256		11,003
Originated | Commercial real estate portfolio segment | AG real estate
Allowance for Loan Losses (ALLL):
Beginning balance	255	235	235
Provision	45		20
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 300		$ 255
As percent of ALLL	2.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	300		255
Loans:
Individually evaluated	878		0
Collectively evaluated	37,738		31,374
Total	38,616		31,374
Net loans	38,316		31,119
Originated | Commercial real estate portfolio segment | CRE investment
Allowance for Loan Losses (ALLL):
Beginning balance	1,230	1,154	1,154
Provision	68		113
Charge-offs	0		(37)
Recoveries	0		0
Net (charge-offs) recoveries	0		(37)
Ending balance	$ 1,298		$ 1,230
As percent of ALLL	11.00%		11.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	1,298		1,230
Loans:
Individually evaluated	0		0
Collectively evaluated	180,427		171,087
Total	180,427		171,087
Net loans	179,129		169,857
Originated | Commercial real estate portfolio segment | Construction & land development
Allowance for Loan Losses (ALLL):
Beginning balance	431	628	628
Provision	(111)		(197)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 320		$ 431
As percent of ALLL	3.00%		4.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	320		431
Loans:
Individually evaluated	0		0
Collectively evaluated	52,806		66,478
Total	52,806		66,478
Net loans	52,486		66,047
Originated | Residential | Residential first mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	1,400	1,297	1,297
Provision	(42)		187
Charge-offs	0		(85)
Recoveries	36		1
Net (charge-offs) recoveries	36		(84)
Ending balance	$ 1,394		$ 1,400
As percent of ALLL	12.00%		12.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	1,394		1,400
Loans:
Individually evaluated	0		0
Collectively evaluated	228,312		220,368
Total	228,312		220,368
Net loans	226,918		218,968
Originated | Residential | Residential junior mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	408	409	409
Provision	22		(31)
Charge-offs	(20)		0
Recoveries	27		30
Net (charge-offs) recoveries	7		30
Ending balance	$ 437		$ 408
As percent of ALLL	4.00%		4.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	437		408
Loans:
Individually evaluated	0		0
Collectively evaluated	89,241		78,379
Total	89,241		78,379
Net loans	88,804		77,971
Originated | Residential | Residential construction
Allowance for Loan Losses (ALLL):
Beginning balance	211	200	200
Provision	323		11
Charge-offs	(226)		0
Recoveries	0		0
Net (charge-offs) recoveries	(226)		0
Ending balance	$ 308		$ 211
As percent of ALLL	3.00%		2.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	308		211
Loans:
Individually evaluated	0		0
Collectively evaluated	41,246		30,926
Total	41,246		30,926
Net loans	40,938		30,715
Acquired
Allowance for Loan Losses (ALLL):
Beginning balance	1,705	2,111	2,111
Provision	(94)		(414)
Charge-offs	(60)		(13)
Recoveries	5		21
Net (charge-offs) recoveries	(55)		8
Ending balance	$ 1,556		$ 1,705
As percent of ALLL	100.00%		100.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	1,556		1,705
Loans:
Individually evaluated	8,251		9,391
Collectively evaluated	583,987		671,625
Total	592,238		681,016
Net loans	590,682		679,311
Acquired | Retail & other
Allowance for Loan Losses (ALLL):
Beginning balance	23	25	25
Provision	(2)		1
Charge-offs	0		(3)
Recoveries	0		0
Net (charge-offs) recoveries	0		(3)
Ending balance	$ 21		$ 23
As percent of ALLL	1.00%		1.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	21		23
Loans:
Individually evaluated	12		12
Collectively evaluated	1,469		2,672
Total	1,481		2,684
Net loans	1,460		2,661
Acquired | Commercial portfolio segment | Commercial & industrial
Allowance for Loan Losses (ALLL):
Beginning balance	588	742	742
Provision	(39)		(155)
Charge-offs	0		0
Recoveries	0		1
Net (charge-offs) recoveries	0		1
Ending balance	$ 549		$ 588
As percent of ALLL	35.00%		34.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	549		588
Loans:
Individually evaluated	1,421		2,700
Collectively evaluated	102,281		114,120
Total	103,702		116,820
Net loans	103,153		116,232
Acquired | Commercial portfolio segment | Owner-occupied CRE
Allowance for Loan Losses (ALLL):
Beginning balance	408	492	492
Provision	(40)		(85)
Charge-offs	0		(10)
Recoveries	0		11
Net (charge-offs) recoveries	0		1
Ending balance	$ 368		$ 408
As percent of ALLL	24.00%		24.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	368		408
Loans:
Individually evaluated	760		1,185
Collectively evaluated	134,425		156,637
Total	135,185		157,822
Net loans	134,817		157,414
Acquired | Commercial portfolio segment | AG production
Allowance for Loan Losses (ALLL):
Beginning balance	11	17	17
Provision	1		(6)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 12		$ 11
As percent of ALLL	1.00%		1.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	12		11
Loans:
Individually evaluated	156		0
Collectively evaluated	24,444		24,512
Total	24,600		24,512
Net loans	24,588		24,501
Acquired | Commercial real estate portfolio segment | AG real estate
Allowance for Loan Losses (ALLL):
Beginning balance	46	61	61
Provision	1		(15)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 47		$ 46
As percent of ALLL	3.00%		3.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	47		46
Loans:
Individually evaluated	211		222
Collectively evaluated	19,764		21,848
Total	19,975		22,070
Net loans	19,928		22,024
Acquired | Commercial real estate portfolio segment | CRE investment
Allowance for Loan Losses (ALLL):
Beginning balance	240	234	234
Provision	(36)		6
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 204		$ 240
As percent of ALLL	13.00%		14.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	204		240
Loans:
Individually evaluated	2,483		1,686
Collectively evaluated	153,532		170,879
Total	156,015		172,565
Net loans	155,811		172,325
Acquired | Commercial real estate portfolio segment | Construction & land development
Allowance for Loan Losses (ALLL):
Beginning balance	79	98	98
Provision	(29)		(19)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 50		$ 79
As percent of ALLL	3.00%		5.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	50		79
Loans:
Individually evaluated	427		603
Collectively evaluated	8,577		13,518
Total	9,004		14,121
Net loans	8,954		14,042
Acquired | Residential | Residential first mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	246	312	312
Provision	(33)		(70)
Charge-offs	0		0
Recoveries	0		4
Net (charge-offs) recoveries	0		4
Ending balance	$ 213		$ 246
As percent of ALLL	14.00%		14.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	213		246
Loans:
Individually evaluated	2,560		2,750
Collectively evaluated	112,528		134,723
Total	115,088		137,473
Net loans	114,875		137,227
Acquired | Residential | Residential junior mortgage
Allowance for Loan Losses (ALLL):
Beginning balance	64	79	79
Provision	49		(20)
Charge-offs	(60)		0
Recoveries	5		5
Net (charge-offs) recoveries	(55)		5
Ending balance	$ 58		$ 64
As percent of ALLL	4.00%		4.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	58		64
Loans:
Individually evaluated	221		233
Collectively evaluated	26,717		32,716
Total	26,938		32,949
Net loans	26,880		32,885
Acquired | Residential | Residential construction
Allowance for Loan Losses (ALLL):
Beginning balance	0	$ 51	51
Provision	34		(51)
Charge-offs	0		0
Recoveries	0		0
Net (charge-offs) recoveries	0		0
Ending balance	$ 34		$ 0
As percent of ALLL	2.00%		0.00%
ALLL:
Individually evaluated	$ 0		$ 0
Collectively evaluated	34		0
Loans:
Individually evaluated	0		0
Collectively evaluated	250		0
Total	250		0
Net loans	$ 216		$ 0

Loans, Allowance for Loan Los_7

Loans, Allowance for Loan Losses, and Credit Quality - Nonaccrual loans by portfolio segment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 9,238	$ 5,471
Percent of total	100.00%	100.00%
Percent of total loans	0.40%	0.20%
Retail & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 8	$ 0
Percent of total	0.00%	0.00%
Commercial portfolio segment | Commercial & industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 2,279	$ 2,816
Percent of total	25.00%	52.00%
Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 2,302	$ 673
Percent of total	25.00%	12.00%
Commercial portfolio segment | AG production
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,251	$ 0
Percent of total	14.00%	0.00%
Commercial real estate portfolio segment | AG real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 846	$ 164
Percent of total	9.00%	3.00%
Commercial real estate portfolio segment | CRE investment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,111	$ 210
Percent of total	12.00%	4.00%
Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 80
Percent of total	0.00%	1.00%
Residential | Residential first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 865	$ 1,265
Percent of total	9.00%	23.00%
Residential | Residential junior mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 576	$ 262
Percent of total	6.00%	5.00%
Residential | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 1
Percent of total	0.00%	0.00%
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 5,076	$ 1,409
Percent of total	100.00%	100.00%
Percent of total loans	55.00%	26.00%
Originated | Retail & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 0
Percent of total	0.00%	0.00%
Originated | Commercial portfolio segment | Commercial & industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 833	$ 352
Percent of total	16.00%	25.00%
Originated | Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,792	$ 362
Percent of total	35.00%	26.00%
Originated | Commercial portfolio segment | AG production
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,095	$ 0
Percent of total	22.00%	0.00%
Originated | Commercial real estate portfolio segment | AG real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 635	$ 0
Percent of total	13.00%	0.00%
Originated | Commercial real estate portfolio segment | CRE investment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 0
Percent of total	0.00%	0.00%
Originated | Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 0
Percent of total	0.00%	0.00%
Originated | Residential | Residential first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 458	$ 629
Percent of total	9.00%	45.00%
Originated | Residential | Residential junior mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 263	$ 65
Percent of total	5.00%	4.00%
Originated | Residential | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 1
Percent of total	0.00%	0.00%
Acquired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 4,162	$ 4,062
Percent of total	100.00%	100.00%
Percent of total loans	45.00%	74.00%
Acquired | Retail & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 8	$ 0
Percent of total	0.00%	0.00%
Acquired | Commercial portfolio segment | Commercial & industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,446	$ 2,464
Percent of total	35.00%	61.00%
Acquired | Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 510	$ 311
Percent of total	12.00%	8.00%
Acquired | Commercial portfolio segment | AG production
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 156	$ 0
Percent of total	4.00%	0.00%
Acquired | Commercial real estate portfolio segment | AG real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 211	$ 164
Percent of total	5.00%	4.00%
Acquired | Commercial real estate portfolio segment | CRE investment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 1,111	$ 210
Percent of total	27.00%	5.00%
Acquired | Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 80
Percent of total	0.00%	2.00%
Acquired | Residential | Residential first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 407	$ 636
Percent of total	10.00%	15.00%
Acquired | Residential | Residential junior mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 313	$ 197
Percent of total	7.00%	5.00%
Acquired | Residential | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 0	$ 0
Percent of total	0.00%	0.00%

Loans, Allowance for Loan Los_8

Loans, Allowance for Loan Losses, and Credit Quality - Summary of loans by past due status (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 2,232,752	$ 2,159,139
Total	$ 2,242,931	$ 2,166,181
Percent of current loans	99.60%	99.70%
Percent of total loans	100.00%	100.00%
30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 941	$ 1,571
Percent past due	0.00%	0.10%
90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 9,238	$ 5,471
Percent past due	0.40%	0.20%
Retail & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 28,581	$ 26,483
Total	28,713	26,493
Retail & other | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	124	10
Retail & other | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	8	0
Commercial portfolio segment | Commercial & industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	761,248	682,104
Total	763,742	684,920
Commercial portfolio segment | Commercial & industrial | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	215	0
Commercial portfolio segment | Commercial & industrial | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	2,279	2,816
Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	454,206	440,123
Total	456,508	441,353
Commercial portfolio segment | Owner-occupied CRE | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	557
Commercial portfolio segment | Owner-occupied CRE | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	2,302	673
Commercial portfolio segment | AG production
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	34,799	35,606
Total	36,050	35,625
Commercial portfolio segment | AG production | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	19
Commercial portfolio segment | AG production | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	1,251	0
Commercial real estate portfolio segment | AG real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	57,745	53,245
Total	58,591	53,444
Commercial real estate portfolio segment | AG real estate | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	35
Commercial real estate portfolio segment | AG real estate | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	846	164
Commercial real estate portfolio segment | CRE investment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	335,331	343,262
Total	336,442	343,652
Commercial real estate portfolio segment | CRE investment | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	180
Commercial real estate portfolio segment | CRE investment | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	1,111	210
Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	61,810	80,519
Total	61,810	80,599
Commercial real estate portfolio segment | Construction & land development | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Commercial real estate portfolio segment | Construction & land development | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	80
Residential | Residential first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	342,216	355,818
Total	343,400	357,841
Residential | Residential first mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	319	758
Residential | Residential first mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	865	1,265
Residential | Residential junior mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	115,320	111,054
Total	116,179	111,328
Residential | Residential junior mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	283	12
Residential | Residential junior mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	576	262
Residential | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	41,496	30,925
Total	41,496	30,926
Residential | Residential construction | 30-89 Days Past Due (accruing)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Residential | Residential construction | 90 Days & Over or nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 0	$ 1

Loans, Allowance for Loan Los_9

Loans, Allowance for Loan Losses, and Credit Quality - Summary of loans by credit quality indicator based on internally assigned credit grade (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,242,931	$ 2,166,181
Percent of total loans	100.00%	100.00%
Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,148,201	$ 2,061,424
Percent of total loans	95.80%	95.10%
Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	$ 49,539	$ 58,822
Percent of total loans	2.20%	2.70%
Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	$ 9,169	$ 18,607
Percent of total loans	0.40%	0.90%
Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	$ 36,022	$ 27,328
Percent of total loans	1.60%	1.30%
Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0
Percent of total loans	0.00%	0.00%
Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0
Percent of total loans	0.00%	0.00%
Retail & other
Financing Receivable, Recorded Investment [Line Items]
Total	$ 28,713	$ 26,493
Retail & other | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	28,705	26,493
Retail & other | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Retail & other | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Retail & other | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	8	0
Retail & other | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Retail & other | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Total	763,742	684,920
Commercial portfolio segment | Commercial & industrial | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	725,484	649,475
Commercial portfolio segment | Commercial & industrial | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	22,299	16,145
Commercial portfolio segment | Commercial & industrial | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	2,076	6,178
Commercial portfolio segment | Commercial & industrial | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	13,883	13,122
Commercial portfolio segment | Commercial & industrial | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | Commercial & industrial | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total	456,508	441,353
Commercial portfolio segment | Owner-occupied CRE | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	428,332	405,198
Commercial portfolio segment | Owner-occupied CRE | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	15,110	22,776
Commercial portfolio segment | Owner-occupied CRE | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	963	6,569
Commercial portfolio segment | Owner-occupied CRE | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	12,103	6,810
Commercial portfolio segment | Owner-occupied CRE | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | Owner-occupied CRE | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | AG production
Financing Receivable, Recorded Investment [Line Items]
Total	36,050	35,625
Commercial portfolio segment | AG production | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	27,350	29,363
Commercial portfolio segment | AG production | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	4,044	3,302
Commercial portfolio segment | AG production | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	1,669	2,351
Commercial portfolio segment | AG production | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	2,987	609
Commercial portfolio segment | AG production | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial portfolio segment | AG production | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | AG real estate
Financing Receivable, Recorded Investment [Line Items]
Total	58,591	53,444
Commercial real estate portfolio segment | AG real estate | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	48,740	46,248
Commercial real estate portfolio segment | AG real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	4,077	3,246
Commercial real estate portfolio segment | AG real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	2,344	2,983
Commercial real estate portfolio segment | AG real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	3,430	967
Commercial real estate portfolio segment | AG real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | AG real estate | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | CRE investment
Financing Receivable, Recorded Investment [Line Items]
Total	336,442	343,652
Commercial real estate portfolio segment | CRE investment | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	332,078	334,080
Commercial real estate portfolio segment | CRE investment | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	2,345	6,792
Commercial real estate portfolio segment | CRE investment | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	908	0
Commercial real estate portfolio segment | CRE investment | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	1,111	2,780
Commercial real estate portfolio segment | CRE investment | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | CRE investment | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Recorded Investment [Line Items]
Total	61,810	80,599
Commercial real estate portfolio segment | Construction & land development | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	61,794	75,365
Commercial real estate portfolio segment | Construction & land development | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	0	5,138
Commercial real estate portfolio segment | Construction & land development | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	16	16
Commercial real estate portfolio segment | Construction & land development | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	0	80
Commercial real estate portfolio segment | Construction & land development | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial real estate portfolio segment | Construction & land development | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential first mortgage
Financing Receivable, Recorded Investment [Line Items]
Total	343,400	357,841
Residential | Residential first mortgage | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	338,627	353,239
Residential | Residential first mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	1,664	1,406
Residential | Residential first mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	1,193	510
Residential | Residential first mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	1,916	2,686
Residential | Residential first mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential first mortgage | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential junior mortgage
Financing Receivable, Recorded Investment [Line Items]
Total	116,179	111,328
Residential | Residential junior mortgage | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	115,595	111,037
Residential | Residential junior mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	0	17
Residential | Residential junior mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential junior mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	584	274
Residential | Residential junior mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential junior mortgage | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential construction
Financing Receivable, Recorded Investment [Line Items]
Total	41,496	30,926
Residential | Residential construction | Grades 1- 4
Financing Receivable, Recorded Investment [Line Items]
Total	41,496	30,926
Residential | Residential construction | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential construction | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential construction | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential construction | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Residential | Residential construction | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0

Loans, Allowance for Loan Lo_10

Loans, Allowance for Loan Losses, and Credit Quality - Summary of information pertaining to impaired loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 12,738	$ 9,939
Unpaid Principal Balance	15,503	16,021
Related Allowance	427	0
Average Recorded Investment	13,794	10,699
Interest Income Recognized	1,033	1,199
Retail & other
Financing Receivable, Impaired [Line Items]
Recorded Investment	12	12
Unpaid Principal Balance	15	12
Related Allowance	0	0
Average Recorded Investment	12	12
Interest Income Recognized	3	1
Commercial portfolio segment | Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,143	2,927
Unpaid Principal Balance	4,271	6,736
Related Allowance	308	0
Average Recorded Investment	2,807	4,041
Interest Income Recognized	739	660
Commercial portfolio segment | Owner-occupied CRE
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,552	1,506
Unpaid Principal Balance	2,930	1,833
Related Allowance	0	0
Average Recorded Investment	2,742	1,659
Interest Income Recognized	170	137
Commercial portfolio segment | AG production
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,251	0
Unpaid Principal Balance	1,263	0
Related Allowance	119	0
Average Recorded Investment	1,295	0
Interest Income Recognized	12	0
Commercial real estate portfolio segment | AG real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,089	222
Unpaid Principal Balance	1,091	281
Related Allowance	0	0
Average Recorded Investment	1,098	238
Interest Income Recognized	2	26
Commercial real estate portfolio segment | CRE investment
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,483	1,686
Unpaid Principal Balance	2,490	2,484
Related Allowance	0	0
Average Recorded Investment	2,524	1,606
Interest Income Recognized	8	163
Commercial real estate portfolio segment | Construction & land development
Financing Receivable, Impaired [Line Items]
Recorded Investment	427	603
Unpaid Principal Balance	427	1,506
Related Allowance	0	0
Average Recorded Investment	480	603
Interest Income Recognized	0	21
Residential | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,560	2,750
Unpaid Principal Balance	2,785	2,907
Related Allowance	0	0
Average Recorded Investment	2,611	2,478
Interest Income Recognized	97	176
Residential | Residential junior mortgage
Financing Receivable, Impaired [Line Items]
Recorded Investment	221	233
Unpaid Principal Balance	231	262
Related Allowance	0	0
Average Recorded Investment	225	62
Interest Income Recognized	2	15
Residential | Residential construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Originated
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,487	548
Unpaid Principal Balance	4,707	548
Related Allowance	427	0
Average Recorded Investment	4,649	899
Interest Income Recognized	176	154
Acquired
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,251	9,391
Unpaid Principal Balance	10,796	15,473
Related Allowance	0	0
Average Recorded Investment	9,145	9,800
Interest Income Recognized	$ 857	$ 1,045

Loans, Allowance for Loan Lo_11

Loans, Allowance for Loan Losses, and Credit Quality - Summary of Non-accretable discount on purchase credit impaired ("PCI") loans (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accretion Discount [Roll Forward]
Balance at beginning of period	$ 6,408	$ 9,471	$ 9,471
Accretion to loan interest income	(3,293)	(1,872)	(1,976)
Transferred to accretable	0	(513)	(990)
Disposals of loans	(660)	(97)	(97)
Balance at end of period	$ 2,455	$ 6,989	$ 6,408

Goodwill and Other Intangible_3

Goodwill and Other Intangibles and Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 107,366	$ 107,366

Goodwill and Other Intangible_4

Goodwill and Other Intangibles and Mortgage Servicing Rights - Goodwill and other intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 107,366	$ 107,366
Other intangibles	14,005	16,941
Goodwill and other intangibles, net	121,371	124,307
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Other intangibles	10,006	12,562
Customer list intangibles:
Finite-Lived Intangible Assets [Line Items]
Other intangibles	$ 3,999	$ 4,379

Goodwill and Other Intangible_5

Goodwill and Other Intangibles and Mortgage Servicing Rights - Other intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Net book value	$ 14,005		$ 14,005		$ 16,941
Amortization during the period	914	$ 1,054	2,936	$ 3,336
Core deposit intangibles:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	29,015		29,015		29,015
Accumulated amortization	(19,009)		(19,009)		(16,453)
Net book value	10,006		10,006		12,562
Additions during the period			0		0
Amortization during the period			2,556		3,915
Customer list intangibles:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,523		5,523		5,523
Accumulated amortization	(1,524)		(1,524)		(1,144)
Net book value	$ 3,999		3,999		4,379
Additions during the period			0		290
Amortization during the period			$ 380		$ 474

Goodwill and Other Intangible_6

Goodwill and Other Intangibles and Mortgage Servicing Rights - Mortgage servicing rights (Details) - Mortgage Servicing Rights - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Mortgage servicing rights (MSR) asset:
MSR asset at beginning of year	$ 3,749	$ 3,187
Capitalized MSR	1,807	1,203
Amortization during the period	(611)	(641)
MSR asset at end of period	4,945	3,749
Fair value of MSR asset at end of period	6,960	6,347
Residential mortgage loans serviced for others	$ 721,569	$ 603,446
Net book value of MSR asset to loans serviced for others	0.69%	0.62%

Goodwill and Other Intangible_7

Goodwill and Other Intangibles and Mortgage Servicing Rights - Estimated future amortization expense (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Net book value	$ 14,005	$ 16,941
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
2019 (remaining three months)	781
2020	2,657
2021	2,167
2022	1,735
2023	1,273
2024	841
Thereafter	552
Net book value	10,006	12,562
Customer list intangibles:
Finite-Lived Intangible Assets [Line Items]
2019 (remaining three months)	127
2020	507
2021	507
2022	507
2023	483
2024	449
Thereafter	1,419
Net book value	3,999	$ 4,379
MSR asset
Finite-Lived Intangible Assets [Line Items]
2019 (remaining three months)	224
2020	879
2021	730
2022	730
2023	658
2024	400
Thereafter	1,324
Net book value	$ 4,945

Short and Long-Term Borrowings-

Short and Long-Term Borrowings-Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2015	Dec. 31, 2018
Debt Instrument
Trust preferred securities qualify as Tier1 capital	$ 29,300,000		$ 28,900,000
Aggregate amount of subordinated notes	$ 38,249,000
FHLB advances
Debt Instrument
FHLB weighted average interest rate	1.95%		1.72%
Repayment of puttable FHLB advance	$ 20,000,000
Subordinated notes
Debt Instrument
Aggregate amount of subordinated notes		$ 12,000,000
Note term		10 years
Stated interest rate		5.00%

Short and Long-Term Borrowing_2

Short and Long-Term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument
Long-term borrowings	$ 57,495	$ 77,305
Percent of fixed rate long-term borrowings	58.00%	69.00%
Percent of floating rate long-term borrowings	42.00%	31.00%
FHLB advances
Debt Instrument
Long-term borrowings	$ 15,056	$ 35,252
Junior subordinated debentures
Debt Instrument
Subordinated debt	30,455	30,096
Subordinated notes
Debt Instrument
Subordinated debt	$ 11,984	$ 11,957

Short and Long-Term Borrowing_3

Short and Long-Term Borrowings Junior Subordinated Debentures (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Junior Subordinated Debentures
Par	$ 38,249,000
Unamortized Discount	(7,794,000)
Carrying value	30,455,000	$ 30,096,000
2005 Mid-Wisconsin Financial Services, Inc.
Junior Subordinated Debentures
Par	10,310,000
Unamortized Discount	(3,222,000)
Carrying value	$ 7,088,000	$ 6,939,000
Stated interest rate	3.55%	4.22%
2006 Baylake Corp.
Junior Subordinated Debentures
Par	$ 16,598,000
Unamortized Discount	(3,942,000)
Carrying value	$ 12,656,000	$ 12,478,000
Stated interest rate	3.45%	4.15%
2004 First Menasha Bancshares, Inc.
Junior Subordinated Debentures
Par	$ 5,155,000
Unamortized Discount	(630,000)
Carrying value	$ 4,525,000	$ 4,493,000
Stated interest rate	4.93%	5.58%
2004 Nicolet Bankshares Statutory Trust
Junior Subordinated Debentures
Par	$ 6,186,000
Unamortized Discount	0
Carrying value	$ 6,186,000	$ 6,186,000
Stated interest rate	8.00%
London Interbank Offered Rate (LIBOR) | 2005 Mid-Wisconsin Financial Services, Inc.
Junior Subordinated Debentures
Floating interest rate	1.43%
London Interbank Offered Rate (LIBOR) | 2006 Baylake Corp.
Junior Subordinated Debentures
Floating interest rate	1.35%
London Interbank Offered Rate (LIBOR) | 2004 First Menasha Bancshares, Inc.
Junior Subordinated Debentures
Floating interest rate	2.79%

Fair Value Measurements - Measu

Fair Value Measurements - Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 419,300	$ 400,144
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,490	21,649
State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	147,786	160,526
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	171,877	131,644
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	83,147	86,325
Fair Value Measurements Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Fair Value Measurements Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	416,470	391,654
Fair Value Measurements Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,830	8,490
Recurring basis fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	419,300	400,144
Recurring basis fair value measurements | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,490	21,649
Recurring basis fair value measurements | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	147,786	160,526
Recurring basis fair value measurements | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	171,877	131,644
Recurring basis fair value measurements | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	83,147	86,325
Recurring basis fair value measurements | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	4,080	2,650
Recurring basis fair value measurements | Fair Value Measurements Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 1 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 1 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 1 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 1 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	4,080	2,650
Recurring basis fair value measurements | Fair Value Measurements Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	416,470	391,654
Recurring basis fair value measurements | Fair Value Measurements Using Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,490	21,649
Recurring basis fair value measurements | Fair Value Measurements Using Level 2 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	147,786	160,460
Recurring basis fair value measurements | Fair Value Measurements Using Level 2 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	171,877	131,644
Recurring basis fair value measurements | Fair Value Measurements Using Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	80,317	77,901
Recurring basis fair value measurements | Fair Value Measurements Using Level 2 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,830	8,490
Recurring basis fair value measurements | Fair Value Measurements Using Level 3 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 3 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	66
Recurring basis fair value measurements | Fair Value Measurements Using Level 3 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Recurring basis fair value measurements | Fair Value Measurements Using Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,830	8,424
Recurring basis fair value measurements | Fair Value Measurements Using Level 3 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	$ 0	$ 0

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 assets measured at fair value on a recurring basis (Details) - Available-for-sale Securities - Level 3 - Recurring basis fair value measurements - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Level 3 Fair Value Measurements:
Balance at beginning of year	$ 8,490	$ 9,151
Paydowns/Sales/Settlements	(5,660)	(661)
Balance at end of period	$ 2,830	$ 8,490

Fair Value Measurements - Mea_2

Fair Value Measurements - Measured at Fair Value on Nonrecurring Basis (Details) - Measured at Fair Value on a Nonrecurring Basis - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 12,311	$ 9,939
Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	1,325	420
MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	6,960	6,347
Fair Value Measurements Using Level 1 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 1 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 1 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 2 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 2 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 2 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Fair Value Measurements Using Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	12,311	9,939
Fair Value Measurements Using Level 3 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	1,325	420
Fair Value Measurements Using Level 3 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 6,960	$ 6,347

Fair Value Measurements - Summa

Fair Value Measurements - Summary of carrying amounts and estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Securities AFS	$ 419,300	$ 400,144
Level 1
Financial assets:
Cash and cash equivalents	143,969	249,526
Certificates of deposit in other banks	0	0
Securities AFS	0	0
Other investments, including equity securities	4,080	2,650
Loans held for sale	0	0
Loans, net	0	0
BOLI	71,796	66,310
MSR asset	0	0
Financial liabilities:
Deposits	0	0
Long-term borrowings	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Certificates of deposit in other banks	5,390	993
Securities AFS	416,470	391,654
Other investments, including equity securities	13,259	13,189
Loans held for sale	10,710	1,662
Loans, net	0	0
BOLI	0	0
MSR asset	0	0
Financial liabilities:
Deposits	0	0
Long-term borrowings	15,135	34,907
Level 3
Financial assets:
Cash and cash equivalents	0	0
Certificates of deposit in other banks	0	0
Securities AFS	2,830	8,490
Other investments, including equity securities	3,358	2,158
Loans held for sale	0	0
Loans, net	2,244,410	2,139,322
BOLI	0	0
MSR asset	6,960	6,347
Financial liabilities:
Deposits	2,584,662	2,614,995
Long-term borrowings	41,544	41,016
Carrying Amount
Financial assets:
Cash and cash equivalents	143,969	249,526
Certificates of deposit in other banks	5,395	993
Securities AFS	419,300	400,144
Other investments, including equity securities	20,697	17,997
Loans held for sale	10,564	1,639
Loans, net	2,229,311	2,153,028
BOLI	71,796	66,310
MSR asset	4,945	3,749
Financial liabilities:
Deposits	2,584,447	2,614,138
Long-term borrowings	57,495	77,305
Estimated Fair Value
Financial assets:
Cash and cash equivalents	143,969	249,526
Certificates of deposit in other banks	5,390	993
Securities AFS	419,300	400,144
Other investments, including equity securities	20,697	17,997
Loans held for sale	10,710	1,662
Loans, net	2,244,410	2,139,322
BOLI	71,796	66,310
MSR asset	6,960	6,347
Financial liabilities:
Deposits	2,584,662	2,614,995
Long-term borrowings	$ 56,679	$ 75,923

Operating Leases - Narrative (D

Operating Leases - Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms of operating leases	2 years
Extension terms of operating leases	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms of operating leases	7 years
Extension terms of operating leases	10 years

Operating Leases - Operating Le

Operating Leases - Operating Lease Cost (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Net lease cost:
Operating lease cost	$ 737
Variable lease cost	179
Net lease cost	$ 916
Selected other operating lease information:
Weighted average remaining lease term (years)	5 years
Weighted average discount rate	2.50%

Operating Leases - Operating _2

Operating Leases - Operating Lease Maturity Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
2019 (remaining three months)	$ 951
2020	1,037
2021	911
2022	851
2023	607
2024	499
Thereafter	16
Total future minimum lease payments	4,872
Less: amount representing interest	(122)
Present value of net future minimum lease payments	$ 4,750	$ 5,000