First Midwest Bancorp (ONBPP) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	0-10967
Entity Registrant Name	First Midwest Bancorp, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3161078
Entity Address, Address Line One	8750 West Bryn Mawr Avenue
Entity Address, Address Line Two	Suite 1300
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60631-3655
City Area Code	708
Local Phone Number	831-7483
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	FMBI
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		109,971,252
Amendment Flag	false
Entity Central Index Key	0000702325
Document Period End Date	Sep. 30, 2019
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 273,613	$ 211,189
Interest-bearing deposits in other banks	202,054	78,069
Equity securities, at fair value	40,723	30,806
Securities available-for-sale, at fair value	2,905,738	2,272,009
Securities held-to-maturity, at amortized cost	22,566	10,176
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock, at cost	112,845	80,302
Loans	12,773,319	11,446,783
Allowance for loan losses	(109,028)	(102,219)
Net loans	12,664,291	11,344,564
Other real estate owned (OREO)	12,428	12,821
Premises, furniture, and equipment, net	147,064	132,502
Investment in bank-owned life insurance (BOLI)	297,610	296,733
Goodwill and other intangible assets	876,219	790,744
Accrued interest receivable and other assets	458,303	245,734
Total assets	18,013,454	15,505,649
Liabilities
Noninterest-bearing deposits	3,832,744	3,642,989
Interest-bearing deposits	9,608,183	8,441,123
Total deposits	13,440,927	12,084,112
Borrowed funds	1,653,490	906,079
Senior and subordinated debt	233,743	203,808
Accrued interest payable and other liabilities	345,695	256,652
Total liabilities	15,673,855	13,450,651
Stockholders' Equity
Common stock	1,204	1,157
Additional paid-in capital	1,208,030	1,114,580
Retained earnings	1,343,895	1,192,767
Accumulated other comprehensive income (loss), net of tax	6,738	(52,512)
Treasury stock, at cost	(220,268)	(200,994)
Total stockholders' equity	2,339,599	2,054,998
Total liabilities and stockholders' equity	$ 18,013,454	$ 15,505,649
Stockholders' Equity, Number of Shares, Par Value, and Other Disclosures
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	120,411,000	115,672,000
Common stock, shares outstanding (in shares)	109,970,000	106,375,000
Treasury stock, shares (in shares)	10,441,000	9,297,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Income
Loans	$ 159,978	$ 133,997	$ 462,462	$ 380,420
Investment securities	19,452	14,170	53,463	38,936
Other short-term investments	2,533	1,365	6,210	3,609
Total interest income	181,963	149,532	522,135	422,965
Interest Expense
Deposits	21,754	10,426	57,672	24,637
Borrowed funds	5,639	3,927	13,649	10,919
Senior and subordinated debt	3,783	3,152	10,691	9,416
Total interest expense	31,176	17,505	82,012	44,972
Net interest income	150,787	132,027	440,123	377,993
Provision for loan losses	12,498	11,248	34,433	38,043
Net interest income after provision for loan losses	138,289	120,779	405,690	339,950
Noninterest Income
Service charges on deposit accounts	13,024	12,378	36,760	36,088
Wealth management fees	12,063	10,622	35,853	32,561
Card-based fees	4,694	4,123	13,621	12,450
Capital market products income	4,161	1,936	7,594	6,313
Mortgage banking income	3,066	1,657	5,971	5,790
Other service charges, commissions, and fees	3,023	2,786	8,417	8,172
Other income	2,920	2,164	8,167	6,756
Total noninterest income	42,951	35,666	116,383	108,130
Noninterest Expense
Salaries and employee benefits	61,481	54,160	177,546	168,879
Net occupancy and equipment expense	13,903	13,183	42,344	40,607
Professional services	9,550	7,944	27,805	23,822
Technology and related costs	5,062	4,763	14,566	14,371
Net OREO expense	381	(413)	1,356	399
Other expenses	14,387	14,541	43,494	40,083
Acquisition and integration related expenses	3,397	60	16,602	60
Delivering Excellence implementation costs	234	2,239	934	17,254
Total noninterest expense	108,395	96,477	324,647	305,475
Income before income tax expense	72,845	59,968	197,426	142,605
Income tax expense	18,300	6,616	49,809	26,143
Net income	$ 54,545	$ 53,352	$ 147,617	$ 116,462
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.49	$ 0.52	$ 1.36	$ 1.13
Diluted earnings per common share (in dollars per share)	0.49	0.52	1.35	1.13
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.11	$ 0.40	$ 0.33
Weighted-average common shares outstanding (in Shares)	109,281	102,178	107,852	102,087
Weighted-average diluted common shares outstanding (in Shares)	109,662	102,178	108,246	102,092

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	$ 54,545	$ 53,352	$ 147,617	$ 116,462
Unrealized holding gains (losses):
Before tax	13,636	(13,632)	78,625	(47,765)
Tax effect	(3,800)	3,548	(21,900)	13,055
Net of tax	9,836	(10,084)	56,725	(34,710)
Derivative Instruments
Before tax	(399)		3,500
Before tax		(880)		(948)
Tax effect	111		(975)
Tax effect		231		250
Net of tax	(288)		2,525
Net of tax		(649)		(698)
Total other comprehensive income (loss)	9,548	(10,733)	59,250	(35,408)
Total comprehensive income	$ 64,093	$ 42,619	$ 206,867	$ 81,054

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income - AOCI - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ 2,054,998	$ 1,864,874
Adjustments to apply recent accounting pronouncements	[1]			$ 0
Ending balance		2,339,599	1,917,675
Accumulated Unrealized (Loss) Gain on Securities Available- for-Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(28,792)	(13,976)
Adjustments to apply recent accounting pronouncements	[2]			(2,864)
Other comprehensive income (loss)		56,725	(34,710)
Ending balance		27,933	(51,550)
Accumulated Unrealized (Loss) Gain on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(2,550)	(3,763)
Adjustments to apply recent accounting pronouncements	[2]			(784)
Other comprehensive income (loss)		2,525	(698)
Ending balance		(25)	(5,245)
Unrecognized Net Pension Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(21,170)	(15,297)
Adjustments to apply recent accounting pronouncements	[2]			(3,041)
Other comprehensive income (loss)		0	0
Ending balance		(21,170)	(18,338)
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(52,512)	(33,036)
Adjustments to apply recent accounting pronouncements	[1],[2]			$ (6,689)
Other comprehensive income (loss)		59,250	(35,408)
Ending balance		$ 6,738	$ (75,133)
[1]	As a result of accounting guidance adopted in the first quarter of 2018, certain reclassifications were made from accumulated other comprehensive income (loss) to retained earnings as of January 1, 2018.
[2]	As a result of accounting guidance adopted in the first quarter of 2018, certain reclassifications were made from accumulated other comprehensive income (loss) to retained earnings as of January 1, 2018.

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2017		102,717,000
Beginning balance at Dec. 31, 2017	$ 1,864,874	$ 1,123	$ 1,031,870	$ 1,074,990	$ (33,036)	$ (210,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116,462			116,462
Other comprehensive income (loss)	(35,408)				(35,408)
Common dividends declared ($0.11 and $0.14 per common share for the quarter ended September 30, 2018 and 2019, respectively and $0.33 and $0.40 per common share for the nine months ended September 30, 2018 and 2019, respectively)	(34,008)			(34,008)
Acquisitions, net of issuance costs	0
Common stock issued (in shares)		8,000
Common stock issued	895	$ 1	227			667
Restricted stock activity (in shares)		335,000
Restricted stock activity	(4,241)		(12,667)			8,426
Treasury stock issued to benefit plans (in shares)		(2,000)
Treasury stock issued to benefit plans	(63)		41			(104)
Share-based compensation expense	9,164		9,164
Ending balance (in shares) at Sep. 30, 2018		103,058,000
Ending balance at Sep. 30, 2018	1,917,675	$ 1,124	1,028,635	1,164,133	(75,133)	(201,084)
Beginning balance (in shares) at Jun. 30, 2018		103,059,000
Beginning balance at Jun. 30, 2018	1,883,563	$ 1,124	1,025,703	1,122,107	(64,400)	(200,971)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,352			53,352
Other comprehensive income (loss)	(10,733)				(10,733)
Common dividends declared ($0.11 and $0.14 per common share for the quarter ended September 30, 2018 and 2019, respectively and $0.33 and $0.40 per common share for the nine months ended September 30, 2018 and 2019, respectively)	(11,326)			(11,326)
Common stock issued (in shares)		3,000
Common stock issued	66		66
Restricted stock activity (in shares)		(4,000)
Restricted stock activity	(194)		(109)			(85)
Treasury stock issued to benefit plans	(21)		7			(28)
Share-based compensation expense	2,968		2,968
Ending balance (in shares) at Sep. 30, 2018		103,058,000
Ending balance at Sep. 30, 2018	$ 1,917,675	$ 1,124	1,028,635	1,164,133	(75,133)	(201,084)
Beginning balance (in shares) at Dec. 31, 2018	106,375,000	106,375,000
Beginning balance at Dec. 31, 2018	$ 2,054,998	$ 1,157	1,114,580	1,192,767	(52,512)	(200,994)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	147,617			147,617
Other comprehensive income (loss)	59,250				59,250
Common dividends declared ($0.11 and $0.14 per common share for the quarter ended September 30, 2018 and 2019, respectively and $0.33 and $0.40 per common share for the nine months ended September 30, 2018 and 2019, respectively)	(43,746)			(43,746)
Repurchases of common stock (in shares)		(1,687,000)
Repurchases of common stock	(33,928)					(33,928)
Acquisitions, net of issuance costs (in shares)		4,879,000
Acquisitions, net of issuance costs	101,496	$ 47	97,351			4,098
Common stock issued (in shares)		34,000
Common stock issued	687		12			675
Restricted stock activity (in shares)		380,000
Restricted stock activity	(3,833)		(13,919)			10,086
Treasury stock issued to benefit plans (in shares)		(11,000)
Treasury stock issued to benefit plans	(217)		(12)			(205)
Share-based compensation expense	$ 10,018		10,018
Ending balance (in shares) at Sep. 30, 2019	109,970,000	109,970,000
Ending balance at Sep. 30, 2019	$ 2,339,599	$ 1,204	1,208,030	1,343,895	6,738	(220,268)
Beginning balance (in shares) at Jun. 30, 2019		110,589,000
Beginning balance at Jun. 30, 2019	2,300,573	$ 1,204	1,205,396	1,304,756	(2,810)	(207,973)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,545			54,545
Other comprehensive income (loss)	9,548				9,548
Common dividends declared ($0.11 and $0.14 per common share for the quarter ended September 30, 2018 and 2019, respectively and $0.33 and $0.40 per common share for the nine months ended September 30, 2018 and 2019, respectively)	(15,406)			(15,406)
Repurchases of common stock (in shares)		(645,000)
Repurchases of common stock	(12,738)					(12,738)
Common stock issued (in shares)		4,000
Common stock issued	82		81			1
Restricted stock activity (in shares)		27,000
Restricted stock activity	(63)		(599)			536
Treasury stock issued to benefit plans (in shares)		(5,000)
Treasury stock issued to benefit plans	(97)		(3)			(94)
Share-based compensation expense	$ 3,155		3,155
Ending balance (in shares) at Sep. 30, 2019	109,970,000	109,970,000
Ending balance at Sep. 30, 2019	$ 2,339,599	$ 1,204	$ 1,208,030	$ 1,343,895	$ 6,738	$ (220,268)

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.11	$ 0.40	$ 0.33

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income	$ 147,617	$ 116,462
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	34,433	38,043
Depreciation of premises, furniture, and equipment	12,182	11,693
Net amortization of premium on securities	11,897	11,444
Gains on sales of 1-4 family mortgages and corporate loans held-for-sale	(6,327)	(4,475)
Net gains on sales and valuation adjustments of OREO	(2,358)	(318)
Amortization of the FDIC indemnification asset	906	906
Net losses on sales and valuation adjustments of premises, furniture, and equipment	1,226	5,423
BOLI income	(5,597)	(4,280)
Share-based compensation expense	10,018	9,164
Tax benefit related to share-based compensation	311	208
Amortization of other intangible assets	7,737	5,368
Originations of mortgage loans held-for-sale	(335,903)	(175,408)
Proceeds from sales of mortgage loans held-for-sale	297,967	193,476
Net increase in equity securities	(2,951)	(1,191)
Net decrease (increase) in accrued interest receivable and other assets	1,244	(14,725)
Net decrease in accrued interest payables and other liabilities	(22,628)	(1,949)
Net cash provided by operating activities	149,774	189,841
Investing Activities
Proceeds from maturities, repayments, and calls of securities available-for-sale	305,973	233,659
Proceeds from sales of securities available-for-sale	93,332	0
Purchases of securities available-for-sale	(703,216)	(595,477)
Proceeds from maturities, repayments, and calls of securities held-to-maturity	3,873	1,087
Purchases of securities held-to-maturity	(2,837)	0
Net purchases of FHLB stock	(31,062)	(18,020)
Net increase in loans	(655,871)	(649,197)
Premiums paid on BOLI, net of proceeds from claims	4,720	106
Proceeds from sales of OREO	9,430	12,951
Proceeds from sales of premises, furniture, and equipment	2,538	549
Purchases of premises, furniture, and equipment	(13,540)	(20,738)
Net cash paid for acquisition	(13,532)	0
Net cash used in investing activities	(1,000,192)	(1,035,080)
Financing Activities
Net increase in deposit accounts	370,061	473,789
Net increase in borrowed funds	745,665	358,662
Purchase of treasury stock	(33,928)	0
Cash dividends paid	(41,138)	(32,942)
Restricted stock activity	(3,833)	(4,241)
Net cash provided by financing activities	1,036,827	795,268
Net increase (decrease) in cash and cash equivalents	186,409	(49,971)
Cash and cash equivalents at beginning of period	289,258	346,570
Cash and cash equivalents at end of period	475,667	296,599
Supplemental Disclosures of Cash Flow Information:
Income taxes paid (refunded)	29,331	(7,001)
Interest paid to depositors and creditors	80,017	43,270
Dividends declared, but unpaid	15,281	11,250
Stock issued for acquisitions, net of issuance costs	101,496	0
Non-cash transfers of loans to OREO	519	4,026
Non-cash transfers of loans to other assets	13,175	0
Non-cash transfers of loans held-for-investment to loans held-for-sale	9,444	12,373
Non-cash transfer of trading securities and securities available-for-sale to equity securities	0	$ 27,855
Non-cash recognition of right-of-use asset/liability	$ 143,561

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation – The accompanying unaudited condensed consolidated interim financial statements ("consolidated financial statements") of First Midwest Bancorp, Inc. (the " Company "), a Delaware corporation, were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (" SEC ") for quarterly reports on Form 10-Q and reflect all adjustments that management deems necessary for the fair presentation of the financial position and results of operations for the periods presented. The results of operations for the quarter and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles (" GAAP ") and general practices within the banking industry. The accompanying consolidated financial statements do not include certain information and note disclosures required by GAAP for complete annual financial statements. Therefore, these financial statements should be read in conjunction with the Company 's 2018 Annual Report on Form 10-K (" 2018 10-K"). The Company uses the accrual basis of accounting for financial reporting purposes. Certain reclassifications were made to prior year amounts to conform to the current year presentation. Use of Estimates – The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates. Principles of Consolidation – The accompanying consolidated financial statements include the financial position and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries and are not included in the consolidated financial statements. The accounting policies related to business combinations, loans, the allowance for credit losses, lease obligations, and derivative financial instruments are presented below. For a summary of all other significant accounting policies, see Note 1, "Summary of Significant Accounting Policies," in the Company 's 2018 10-K. Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Assets acquired and liabilities assumed are recorded at their estimated fair values as of the date of acquisition, with any excess of the purchase price of the acquisition over the fair value of the identifiable net tangible and intangible assets acquired recorded as goodwill. Alternatively, a gain is recorded if the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. The results of operations of the acquired business are included in the Condensed Consolidated Statements of Income from the effective date of the acquisition. Loans – Loans held-for-investment are loans that the Company intends to hold until they are paid in full and are carried at the principal amount outstanding, including certain net deferred loan origination fees. Loan origination fees, commitment fees, and certain direct loan origination costs are deferred, and the net amount is amortized as a yield adjustment over the contractual life of the related loans or commitments and included in interest income. Fees related to letters of credit are amortized into fee income over the contractual life of the commitment. Other credit-related fees are recognized as fee income when earned. The Company 's net investment in direct financing leases is included in loans and consists of future minimum lease payments and estimated residual values, net of unearned income. Interest income on loans is accrued based on principal amounts outstanding. Loans held-for-sale are carried at the lower of aggregate cost or fair value and included in other assets in the Consolidated Statements of Financial Condition. Acquired and Covered Loans – Covered loans consists of loans acquired by the Company in Federal Deposit Insurance Corporation (" FDIC ")-assisted transactions that are covered by loss share agreements with the FDIC (the " FDIC Agreements "), under which the FDIC reimburses the Company for the majority of the losses and eligible expenses related to these assets during the coverage period. Acquired loans consist of all other loans that were acquired in business combinations that are not covered by the FDIC Agreements. Certain loans that were previously classified as covered loans are no longer covered under the FDIC Agreements, and are included in acquired loans. Covered loans and acquired loans are included within loans held-for-investment. Acquired and covered loans are separated into (i) non-purchased credit impaired (" non-PCI ") loans and (ii) purchased credit impaired (" PCI ") loans. Non-PCI loans include loans that did not have evidence of credit deterioration since origination at the acquisition date. PCI loans include loans that had evidence of credit deterioration since origination and for which it was probable at acquisition that the Company would not collect all contractually required principal and interest payments. Evidence of credit deterioration was evaluated using various indicators, such as past due and non-accrual status. Leases and revolving loans do not qualify to be accounted for as PCI loans and are accounted for as non-PCI loans. The acquisition adjustment related to non-PCI loans is amortized into interest income over the contractual life of the related loans. If an acquired non-PCI loan is renewed subsequent to the acquisition date, any remaining acquisition adjustment is accreted into interest income and the loan is considered a new loan that is no longer classified as an acquired loan. PCI loans are accounted for based on estimates of expected future cash flows. To estimate the fair value, the Company generally aggregates purchased consumer loans and commercial loans into pools of loans with common risk characteristics, such as delinquency status, credit score, and internal risk ratings. The fair values of larger balance commercial loans are estimated on an individual basis. Expected future cash flows in excess of the fair value of loans at the purchase date ("accretable yield") are recorded as interest income over the life of the loans if the timing and amount of the expected future cash flows can be reasonably estimated. The non-accretable yield represents the difference between contractually required payments and the expected future cash flows determined at acquisition. Subsequent increases in expected future cash flows are offset against the allowance for credit losses to the extent an allowance has been established or otherwise recognized as interest income prospectively. The present value of any decreases in expected future cash flows is recognized by recording a charge-off through the allowance for loan losses or providing an allowance for loan losses. 90-Days Past Due Loans – The Company 's accrual of interest on loans is generally discontinued at the time the loan is 90 days past due unless the credit is sufficiently collateralized and in the process of renewal or collection. Non-accrual Loans – Generally, corporate loans are placed on non-accrual status (i) when either principal or interest payments become 90 days or more past due unless the credit is sufficiently collateralized and in the process of renewal or collection, or (ii) when an individual analysis of a borrower's creditworthiness warrants a downgrade to non-accrual regardless of past due status. When a loan is placed on non-accrual status, unpaid interest credited to income in the current year is reversed, and unpaid interest accrued in prior years is charged against the allowance for loan losses. After the loan is placed on non-accrual status, all debt service payments are applied to the principal on the loan. Future interest income may only be recorded on a cash basis after recovery of principal is reasonably assured. Non-accrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate that the Company will collect all principal and interest. Commercial loans and loans secured by real estate are charged-off when deemed uncollectible. A loss is recorded if the net realizable value of the underlying collateral is less than the outstanding principal and interest. Consumer loans that are not secured by real estate are subject to mandatory charge-off at a specified delinquency date and are usually not classified as non-accrual prior to being charged-off. Closed-end consumer loans, which include installment, automobile, and single payment loans, are usually charged-off no later than the end of the month in which the loan becomes 120 days past due. PCI loans are generally considered accruing loans unless reasonable estimates of the timing and amount of expected future cash flows cannot be determined. Loans without reasonable future cash flow estimates are classified as non-accrual loans, and interest income is not recognized on those loans until the timing and amount of the expected future cash flows can be reasonably determined. Troubled Debt Restructurings ( " TDR s" ) – A restructuring is considered a TDR when (i) the borrower is experiencing financial difficulties, and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity date. Loans are not classified as TDR s when the modification is short-term or results in an insignificant delay in payments. The Company 's TDR s are determined on a case-by-case basis. The Company does not accrue interest on a TDR unless it believes collection of all principal and interest under the modified terms is reasonably assured. For a TDR to begin accruing interest, the borrower must demonstrate some level of past performance and the future capacity to perform under the modified terms. Generally, six months of consecutive payment performance under the restructured terms is required before a TDR is returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower's current creditworthiness is used to assess the borrower's capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected future cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. For TDR s to be removed from TDR status in the calendar year after the restructuring, the loans must (i) have an interest rate and terms that reflect market conditions at the time of restructuring, and (ii) be in compliance with the modified terms. If the loan was restructured at below market rates and terms, it continues to be separately reported as restructured until it is paid in full or charged-off. Impaired Loans – Impaired loans consist of corporate non-accrual loans and TDR s. A loan is considered impaired when it is probable that the Company will not collect all contractual principal and interest. With the exception of accruing TDR s, impaired loans are classified as non-accrual and are exclusive of smaller homogeneous loans, such as home equity, 1-4 family mortgages, and installment loans. Impaired loans with balances under a specified threshold are not individually evaluated for impairment. For all other impaired loans, impairment is measured by comparing the estimated value of the loan to the recorded book value. The value of collateral-dependent loans is based on the fair value of the underlying collateral, less costs to sell. The value of other loans is measured using the present value of expected future cash flows discounted at the loan's initial effective interest rate. Allowance for Credit Losses – The allowance for credit losses is comprised of the allowance for loan losses and the reserve for unfunded commitments, and is maintained by management at a level believed adequate to absorb estimated losses inherent in the existing loan portfolio. Determination of the allowance for credit losses is subjective since it requires significant estimates and management judgment, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans, consideration of current economic trends, and other factors. Loans deemed to be uncollectible are charged-off against the allowance for loan losses, while recoveries of amounts previously charged-off are credited to the allowance for loan losses. Additions to the allowance for loan losses are charged to expense through the provision for loan losses. The amount of provision depends on a number of factors, including net charge-off levels, loan growth, changes in the composition of the loan portfolio, and the Company 's assessment of the allowance for loan losses based on the methodology discussed below. Allowance for Loan Losses – The allowance for loan losses consists of (i) specific reserves for individual loans where the recorded investment exceeds the value, (ii) an allowance based on a loss migration analysis that uses historical credit loss experience for each loan category, and (iii) an allowance based on other internal and external qualitative factors. The specific reserves component of the allowance for loan losses is based on a periodic analysis of impaired loans exceeding a fixed dollar amount. If the value of an impaired loan is less than the recorded book value, the Company either establishes a valuation allowance (i.e., a specific reserve) equal to the excess of the book value over the collateral value of the loan as a component of the allowance for loan losses or charges off the amount if it is a confirmed loss. The general reserve component is based on a loss migration analysis, which examines actual loss experience by loan category for a rolling eight quarter period and the related internal risk rating for corporate loans. The loss migration analysis is updated quarterly, primarily using actual loss experience. This component is then adjusted based on management's consideration of many internal and external qualitative factors, including: • Changes in the composition of the loan portfolio, trends in the volume of loans, and trends in delinquent and non-accrual loans that could indicate that historical trends do not reflect current conditions. • Changes in credit policies and procedures, such as underwriting standards and collection, charge-off, and recovery practices. • Changes in the experience, ability, and depth of credit management and other relevant staff. • Changes in the quality of the Company 's loan review system and Board of Directors oversight. • The effect of any concentration of credit and changes in the level of concentrations, such as loan type or risk rating. • Changes in the value of the underlying collateral for collateral-dependent loans. • Changes in the national and local economy that affect the collectability of various segments of the portfolio. • The effect of other external factors, such as competition and legal and regulatory requirements, on the Company 's loan portfolio. The allowance for loan losses also consists of an allowance on acquired and covered non-PCI and PCI loans. No allowance for loan losses is recorded on acquired loans at the acquisition date. Subsequent to the acquisition date, an allowance for credit losses is established as necessary to reflect credit deterioration. The acquired non-PCI allowance is based on management's evaluation of the acquired non-PCI loan portfolio giving consideration to the current portfolio balance, including the remaining acquisition adjustments, maturity dates, and overall credit quality. The allowance for covered non-PCI loans is calculated in the same manner as the general reserve component based on a loss migration analysis as discussed above. The acquired and covered PCI allowance reflects the difference between the carrying value and the discounted expected future cash flows of the acquired and covered PCI loans. On a periodic basis, the adequacy of this allowance is determined through a re-estimation of expected future cash flows on all of the outstanding acquired and covered PCI loans using either a probability of default/loss given default (" PD/LGD ") methodology or a specific review methodology. The PD/LGD model is a loss model that estimates expected future cash flows using a probability of default curve and loss given default estimates. Acquired non-PCI loans that have renewed subsequent to the respective acquisition dates are no longer classified as acquired loans. Instead, they are included in the general loan population and allocated an allowance based on a loss migration analysis. Reserve for Unfunded Commitments – The Company also maintains a reserve for unfunded commitments, including letters of credit, for the risk of loss inherent in these arrangements. The reserve for unfunded commitments is estimated using the loss migration analysis from the allowance for loan losses, adjusted for probabilities of future funding requirements. The reserve for unfunded commitments is included in other liabilities in the Consolidated Statements of Financial Condition. The establishment of the allowance for credit losses involves a high degree of judgment given the difficulty of assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the adequacy of the allowance for credit losses depends on a variety of factors beyond the Company 's control, including the performance of its loan portfolio, the economy, changes in interest rates and property values, and the interpretation of loan risk classifications by regulatory authorities. Lease Obligations – The Company leases certain premises under non-cancelable operating leases in the normal course of business operations. These lease obligations result in the recognition of right-of-use assets and associated lease liabilities. The amount of right-of-use assets and associated lease liabilities recorded is based on the present value of future minimum lease payments. Right-of-use assets are amortized on a straight-line basis over the estimated useful lives of the related premises, and interest associated with the net present value of future minimum lease payments is included in net occupancy and equipment expense in the consolidated financial statements. Derivative Financial Instruments – To provide derivative products to customers and in the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy to minimize significant unplanned fluctuations in earnings and expected future cash flows caused by interest rate volatility. All derivative instruments are recorded at fair value as either other assets or other liabilities in the Consolidated Statements of Financial Condition. Subsequent changes in a derivative's fair value are recognized in earnings unless specific hedge accounting criteria are met. On the date the Company enters into a derivative contract, the derivative is designated as a fair value hedge, a cash flow hedge, or a non-hedge derivative instrument. Fair value hedges are designed to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk. Cash flow hedges are designed to mitigate exposure to variability in expected future cash flows to be received or paid related to an asset, liability, or other type of forecasted transaction. The Company formally documents all relationships between hedging instruments and hedged items, including its risk management objective and strategy at inception. At the hedge's inception, a formal assessment is performed to determine the effectiveness of the derivative in offsetting changes in the fair values or expected future cash flows of the hedged items in the current period and prospectively. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued prospectively, and the gain or loss is amortized into earnings. For fair value hedges, the gain or loss is amortized over the remaining life of the hedged asset or liability. For cash flow hedges, the gain or loss is amortized over the same period that the forecasted hedged transactions impact earnings. If the hedged item is disposed of, any fair value adjustments are included in the gain or loss from the disposition of the hedged item. If the forecasted transaction is no longer probable, the gain or loss is included in earnings immediately. For fair value hedges, changes in the fair value of the derivative instruments, as well as changes in the fair value of the hedged item, are recognized in earnings in the same income statement line item as the earnings effect of the hedged item. For cash flow hedges, the effective portion of the change in fair value of the derivative instrument is reported as a component of accumulated other comprehensive loss and is reclassified to earnings when the hedged transaction is reflected in earnings.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Adopted Accounting Pronouncements Leases: In February of 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02 to increase transparency and comparability across entities for leasing arrangements. This guidance requires lessees to recognize assets and liabilities for most leases. For lessors, this guidance modifies the lease classification criteria and the accounting for sales-type and direct financing leases. In addition, this guidance clarifies criteria for the determination of whether a contract is or contains a lease. This guidance is effective for annual and interim periods beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019, which resulted in the recognition of $143.6 million of right-of-use assets and additional associated lease liabilities for its operating leases. The amount of right-of-use assets and associated lease liabilities recorded upon adoption was based on the present value of future minimum lease payments, the amount of which depended on the population of leases in effect at the date of adoption. This guidance also applies to the Company's net investment in direct financing leases, which is included in loans, but did not have a material impact. The Company has elected certain practical expedients contained in this guidance, which, among other provisions, allowed the Company to not reassess the historical lease classification, initial direct costs, or existing contracts for the inclusion of leases. The Company has also elected the practical expedients for the use of hindsight in determining the lease term and the right-of-use assets, as well as an election not to apply the recognition requirements of the guidance to leases with terms of 12 months or less. The application of the hindsight practical expedient resulted in the determination that most renewal options would not be reasonably certain in determining the expected lease term. First Midwest Bank (the "Bank") entered into a sale-leaseback transaction in 2016 that resulted in a deferred gain. Upon adoption of this guidance, the remaining deferred gain of $47.3 million after-tax was recognized immediately as a cumulative-effect adjustment to equity. For additional discussion of the sale-leaseback transaction, see Note 8 , " Lease Obligations ." The adoption of this guidance was applied retrospectively at the beginning of the period of adoption through a cumulative-effect adjustment and did not materially impact the Company 's results of operations or liquidity but did result in a material increase in assets, liabilities, and equity. Premium Amortization on Purchased Callable Debt Securities: In March of 2017, the FASB issued ASU 2017-08 that shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Improvements to Nonemployee Share-based Payment Accounting: In June of 2018, the FASB issued ASU 2018-07 that aligns the measurement and classification guidance for share-based payments to nonemployees with the guidance for share-based payments to employees. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract: In August of 2018, the FASB issued ASU 2018-15 to reduce diversity in practice by clarifying when implementation costs are required to be capitalized in a cloud computing arrangement that is a service contract. This guidance is effective for annual and interim periods beginning after December 15, 2019. The early adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Derivatives and Hedging, Inclusion of the Secured Overnight Financing Rate ("SOFR") Overnight Index Swap Rate as a Benchmark Interest Rate for Hedge Accounting Purposes: In October of 2018, the FASB issued ASU 2018-16 adding the overnight index swap rate based on the SOFR to the list of United States benchmark interest rates eligible for hedge accounting purposes. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Accounting Pronouncements Pending Adoption Measurement of Credit Losses on Financial Instruments: In June of 2016, the FASB issued ASU 2016-13 that will require entities to present financial assets measured at amortized cost at the net amount expected to be collected, considering an entity's current estimate of all expected credit losses. In addition, credit losses relating to available-for-sale debt securities will be required to be recorded through an allowance for credit losses, with changes in credit loss estimates recognized through current earnings. This guidance is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted, but not for periods beginning before December 15, 2018. The Company will adopt this guidance on January 1, 2020. Management is continuing its implementation efforts, which are led by a cross-functional working group. Management is in the process of determining the impact on the Company's financial condition, results of operations, liquidity, and regulatory capital ratios, but expects that the adoption of this guidance will result in an increase in the allowance for credit losses. The extent of the increase will depend on the composition of the loan portfolio, as well as the economic conditions and forecasts as of the adoption date. Accounting for Goodwill Impairment: In January of 2017, the FASB issued ASU 2017-04 that simplifies the accounting for goodwill impairment for all entities. The new guidance eliminates the requirement to calculate the implied fair value of goodwill using the second step of the quantitative two-step goodwill impairment model prescribed under current accounting guidance. Under the new guidance, if a reporting unit's carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. This guidance is effective for annual and interim goodwill impairment testing dates beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity. Changes to the Disclosure Requirements for Fair Value Measurement: In August of 2018, the FASB issued ASU 2018-13 that eliminates, modifies, and adds to certain fair value measurement disclosure requirements associated with the three-tiered fair value hierarchy. This guidance is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity. Changes to the Disclosure Requirements for Defined Benefit Plans: In August of 2018, the FASB issued ASU 2018-14 that makes minor changes and clarifications to the disclosure requirements for entities that sponsor defined benefit plans. This guidance is effective for annual and interim periods beginning after December 15, 2020. Early adoption is permitted. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS Pending Park Bank On August 27, 2019, the Company entered into a merger agreement to acquire Bankmanagers Corp. ("Bankmanagers"), the holding company for Park Bank, based in Milwaukee Wisconsin. As of June 30, 2019, Bankmanagers had approximately $1.0 billion of assets, $815 million of deposits, and $700 million of loans. The merger agreement provides for a fixed exchange ratio of 29.9675 shares of Company common stock, plus $623.02 of cash, for each share of Bankmanagers common stock, subject to certain adjustments. As of the date of announcement, the overall transaction was valued at approximately $195 million . The transaction is subject to customary regulatory approvals, the approval of Bankmanagers' shareholders, and the completion of various closing conditions. Completed Acquisitions Bridgeview Bancorp, Inc. On May 9, 2019, the Company completed its acquisition of Bridgeview Bancorp, Inc. ("Bridgeview"), the holding company for Bridgeview Bank Group. At closing, the Company acquired $1.2 billion of assets, $1.0 billion of deposits, and $711.7 million of loans, net of fair value adjustments. Under the terms of the merger agreement, on May 9, 2019, each outstanding share of Bridgeview common stock was exchanged for 0.2767 shares of Company common stock, plus $1.66 of cash. In addition, each outstanding Bridgeview stock option was exchanged for the right to receive cash. This resulted in merger consideration of $135.4 million , which consisted of 4,728,541 shares of Company common stock and $37.1 million of cash. Goodwill of $57.7 million associated with the acquisition was recorded by the Company. All Bridgeview operating systems were converted to the Company's operating platform during the second quarter of 2019. The fair value adjustments, including goodwill, associated with this transaction remain preliminary and may change as the Company continues to finalize the fair value of the assets and liabilities acquired. Northern Oak Wealth Management, Inc. On January 16, 2019, the Company completed its acquisition of Northern Oak Wealth Management, Inc. ("Northern Oak"), a registered investment adviser based in Milwaukee, Wisconsin with approximately $800.0 million of assets under management at closing. The fair value adjustments, including goodwill, associated with this transaction remain preliminary and may change as the Company continues to finalize the fair value of the assets and liabilities acquired. Northern States Financial Corporation On October 12, 2018, the Company completed its acquisition of Northern States Financial Corporation ("Northern States"), the holding company for NorStates Bank, based in Waukegan, Illinois. At closing, the Company acquired $579.3 million of assets, $463.2 million of deposits, and $284.9 million of loans, net of fair value adjustments. Under the terms of the merger agreement, on October 12, 2018, each outstanding share of Northern States common stock was exchanged for 0.0363 shares of Company common stock. This resulted in merger consideration of $83.3 million , which consisted of 3,310,912 shares of Company common stock. Goodwill of $30.0 million associated with the acquisition was recorded by the Company. All Northern States operating systems were converted to the Company's operating platform during the fourth quarter of 2018. During the third quarter of 2019, the Company finalized the fair value adjustments associated with the Northern States transaction, which required a measurement period adjustment to goodwill. This adjustment was recognized in the current period in accordance with accounting guidance applicable to business combinations. The following table presents the assets acquired and liabilities assumed, net of the fair value adjustments, in the Bridgeview and Northern States transactions as of the acquisition date. The assets acquired and liabilities assumed, both intangible and tangible, were recorded at their estimated fair values as of the acquisition date and have been accounted for under the acquisition method of accounting. Acquisition Activity (Dollar amounts in thousands, except share and per share data) Bridgeview Northern States May 9, 2019 October 12, 2018 Assets Cash and due from banks and interest-bearing deposits in other banks $ 35,097 $ 160,145 Equity securities 6,966 3,915 Securities available-for-sale 263,090 47,149 Securities held-to-maturity 13,426 — FHLB and FRB stock 1,481 554 Loans 711,688 284,940 OREO 6,160 2,549 Investment in BOLI — 11,104 Goodwill 57,651 30,016 Other intangible assets 15,603 12,230 Premises, furniture, and equipment 18,095 5,820 Accrued interest receivable and other assets 32,534 20,911 Total assets $ 1,161,791 $ 579,333 Liabilities Noninterest-bearing deposits $ 179,267 $ 346,714 Interest-bearing deposits 807,487 116,446 Total deposits 986,754 463,160 Borrowed funds 1,746 18,218 Senior and subordinated debt 29,360 8,038 Accrued interest payable and other liabilities 8,579 6,614 Total liabilities 1,026,439 496,030 Consideration Paid Common stock (2019 – 4,728,541, shares issued at $28.61 per share, 2018 – 3,310,912, shares issued at $25.16 per share), net of issuance costs 98,212 83,303 Cash paid 37,140 — Total consideration paid 135,352 83,303 $ 1,161,791 $ 579,333 Expenses related to the acquisition and integration of completed and pending transactions totaled $3.4 million and $16.6 million during the quarter and nine months ended September 30, 2019 , respectively, and are reported as a separate component within noninterest expense in the Condensed Consolidated Statements of Income.

Securities

Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES The significant accounting policies related to securities are presented in Note 1 , " Summary of Significant Accounting Policies " to the Consolidated Financial Statements in the Company 's 2018 10-K. A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ 40,946 $ 143 $ (4 ) $ 41,085 $ 37,925 $ 17 $ (175 ) $ 37,767 U.S. agency securities 243,863 1,251 (1,027 ) 244,087 144,125 45 (1,607 ) 142,563 Collateralized mortgage obligations ("CMOs") 1,567,116 25,483 (2,046 ) 1,590,553 1,336,531 3,362 (24,684 ) 1,315,209 Other mortgage-backed securities ("MBSs") 668,935 9,753 (1,181 ) 677,507 477,665 520 (11,251 ) 466,934 Municipal securities 231,757 5,722 (45 ) 237,434 229,600 461 (2,874 ) 227,187 Corporate debt securities 114,407 1,389 (724 ) 115,072 86,074 — (3,725 ) 82,349 Total securities available-for-sale $ 2,867,024 $ 43,741 $ (5,027 ) $ 2,905,738 $ 2,311,920 $ 4,405 $ (44,316 ) $ 2,272,009 Securities Held-to-Maturity Municipal securities $ 22,566 $ — $ (584 ) $ 21,982 $ 10,176 $ — $ (305 ) $ 9,871 Equity Securities $ 40,723 $ 30,806 Remaining Contractual Maturity of Securities (Dollar amounts in thousands) As of September 30, 2019 Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value One year or less $ 178,227 $ 180,121 $ 9,002 $ 8,769 After one year to five years 175,643 177,509 6,158 5,999 After five years to ten years 277,094 280,039 4,456 4,341 After ten years 9 9 2,950 2,873 Securities that do not have a single contractual maturity date 2,236,051 2,268,060 — — Total $ 2,867,024 $ 2,905,738 $ 22,566 $ 21,982 The carrying value of securities available-for-sale that were pledged to secure deposits or for other purposes as permitted or required by law totaled $1.7 billion as of September 30, 2019 and $1.2 billion as of December 31, 2018 . No securities held-to-maturity were pledged as of September 30, 2019 or December 31, 2018 . During the quarters and nine months ended September 30, 2019 and 2018 there were no realized gains on securities available-for-sale. Certain securities acquired in the Bridgeview transaction in the second quarter of 2019 were sold shortly after the acquisition date for $93.3 million , resulting in no gains or losses as the securities were recorded at fair value upon acquisition. Accounting guidance requires that the credit portion of an other-than-temporary impairment (" OTTI ") charge be recognized through income. If a decline in fair value below carrying value is not attributable to credit deterioration and the Company does not intend to sell the security or believe it would not be more likely than not required to sell the security prior to recovery, the Company records the non-credit related portion of the decline in fair value in other comprehensive income (loss). There was no outstanding balance of OTTI previously recognized on securities available-for-sale as of either September 30, 2019 or December 31, 2018 . During the quarters and nine months ended September 30, 2019 and 2018 no OTTI was recognized on securities available-for-sale. The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of September 30, 2019 and December 31, 2018 . Securities in an Unrealized Loss Position (Dollar amounts in thousands) Less Than 12 Months 12 Months or Longer Total Number of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses As of September 30, 2019 Securities Available-for-Sale U.S. treasury securities 5 $ 1,981 $ 1 $ 7,003 $ 3 $ 8,984 $ 4 U.S. agency securities 46 62,206 447 60,746 580 122,952 1,027 CMOs 105 60,802 454 288,184 1,592 348,986 2,046 MBSs 54 10,104 38 167,952 1,143 178,056 1,181 Municipal securities 35 1,194 8 13,975 37 15,169 45 Corporate debt securities 8 9,893 107 29,472 617 39,365 724 Total 253 $ 146,180 $ 1,055 $ 567,332 $ 3,972 $ 713,512 $ 5,027 Securities Held-to-Maturity Municipal securities 31 $ 12,467 $ 331 $ 9,515 $ 253 $ 21,982 $ 584 As of December 31, 2018 Securities Available-for-Sale U.S. treasury securities 17 $ 15,894 $ 57 $ 13,886 $ 118 $ 29,780 $ 175 U.S. agency securities 74 34,263 320 93,227 1,287 127,490 1,607 CMOs 234 171,901 1,671 863,747 23,013 1,035,648 24,684 MBSs 118 135,791 1,715 284,273 9,536 420,064 11,251 Municipal securities 423 60,863 558 109,935 2,316 170,798 2,874 Corporate debt securities 16 82,349 3,725 — — 82,349 3,725 Total 882 $ 501,061 $ 8,046 $ 1,365,068 $ 36,270 $ 1,866,129 $ 44,316 Securities Held-to-Maturity Municipal securities 5 $ — $ — $ 9,871 $ 305 $ 9,871 $ 305 Substantially all of the Company 's CMO s and other MBSs are either backed by U.S. government-owned agencies or issued by U.S. government-sponsored enterprises. Municipal securities are issued by municipal authorities, and the majority are supported by third-party insurance or some other form of credit enhancement. Management does not believe any of these securities with unrealized losses as of September 30, 2019 represent OTTI related to credit deterioration. These unrealized losses are attributed to changes in interest rates and temporary market movements. The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell them before recovery of their amortized cost basis, which may be at maturity.

Loans

Loans	9 Months Ended
	Sep. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans	LOANS Loans Held-for-Investment The following table presents the Company 's loans held-for-investment by class. Loan Portfolio (Dollar amounts in thousands) As of September 30, December 31, Commercial and industrial $ 4,570,361 $ 4,120,293 Agricultural 417,740 430,928 Commercial real estate: Office, retail, and industrial 1,892,877 1,820,917 Multi-family 817,444 764,185 Construction 637,256 649,337 Other commercial real estate 1,425,292 1,361,810 Total commercial real estate 4,772,869 4,596,249 Total corporate loans 9,760,970 9,147,470 Home equity 833,955 851,607 1-4 family mortgages 1,686,967 1,017,181 Installment 491,427 430,525 Total consumer loans 3,012,349 2,299,313 Total loans $ 12,773,319 $ 11,446,783 Deferred loan fees included in total loans $ 7,233 $ 6,715 Overdrawn demand deposits included in total loans 10,440 8,583 The Company primarily lends to community-based and mid-sized businesses, commercial real estate customers, and consumers in its markets. Within these areas, the Company diversifies its loan portfolio by loan type, industry, and borrower. It is the Company 's policy to review each prospective credit to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with state lending laws, the Company 's lending standards, and credit monitoring and remediation procedures. A discussion of risk characteristics relevant to each portfolio segment is presented in Note 5 , "Loans" to the Consolidated Financial Statements in the Company 's 2018 10-K. Loan Sales The following table presents loan sales for the quarters and nine months ended September 30, 2019 and 2018 . Loan Sales (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Corporate loan sales Proceeds from sales $ 5,108 $ 2,868 $ 10,484 $ 15,180 Less book value of loans sold 4,950 2,827 10,198 14,811 Net gains on corporate loan sales (1) 158 41 286 369 1-4 family mortgage loan sales Proceeds from sales $ 143,776 $ 62,576 $ 297,967 $ 193,476 Less book value of loans sold 140,998 61,276 291,926 189,370 Net gains on 1-4 family mortgage loan sales (2) 2,778 1,300 6,041 4,106 Total net gains on loan sales $ 2,936 $ 1,341 $ 6,327 $ 4,475 (1) Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income. (2) Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income. The Company retained servicing responsibilities for a portion of the 1-4 family mortgage loans sold and collects servicing fees equal to a percentage of the outstanding principal balance. For additional disclosure related to the Company's obligations resulting from the sale of certain 1-4 family mortgage loans, see Note 12 , " Commitments, Guarantees, and Contingent Liabilities ."

Acquired and Covered Loans

Acquired and Covered Loans	9 Months Ended
	Sep. 30, 2019
Transfers and Servicing [Abstract]
Acquired and Covered Loans	ACQUIRED AND COVERED LOANS The significant accounting policies related to acquired and covered loans, which are classified as PCI and non-PCI , are presented in Note 1 , " Summary of Significant Accounting Policies ." The following table presents the carrying amount of acquired and covered PCI and non-PCI loans as of September 30, 2019 and December 31, 2018 . Acquired and Covered Loans (1) (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 PCI Non-PCI Total PCI Non-PCI Total Acquired loans $ 160,360 $ 1,404,960 $ 1,565,320 $ 108,049 $ 1,247,492 $ 1,355,541 Covered loans 5,466 4,017 9,483 5,819 4,869 10,688 Total acquired and covered loans $ 165,826 $ 1,408,977 $ 1,574,803 $ 113,868 $ 1,252,361 $ 1,366,229 (1) Included in loans in the Consolidated Statements of Financial Condition. The outstanding balance of PCI loans was $244.8 million and $175.2 million as of September 30, 2019 and December 31, 2018 , respectively. Acquired non-PCI loans that are renewed are no longer classified as acquired loans. These loans totaled $512.6 million and $458.0 million as of September 30, 2019 and December 31, 2018 , respectively. In connection with the FDIC Agreements , the Company recorded an indemnification asset. The carrying value of the FDIC indemnification asset was $1.2 million and $2.1 million as of September 30, 2019 and December 31, 2018 , respectively. Changes in the accretable yield for acquired and covered PCI loans were as follows. Changes in Accretable Yield (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Beginning balances $ 50,885 $ 39,008 $ 43,725 $ 32,957 Additions — — 16,037 — Accretion (5,759 ) (3,008 ) (13,630 ) (9,548 ) Other (1) (613 ) 2,672 (1,619 ) 15,263 Ending balance $ 44,513 $ 38,672 $ 44,513 $ 38,672 (1) Increases represent a rise in the expected future cash flows to be collected over the remaining estimated life of the underlying portfolio, while decreases result from the resolution of certain loans occurring earlier than anticipated. Total accretion on acquired and covered PCI and non-PCI loans for the quarters and nine months ended September 30, 2019 was $9.2 million and $25.9 million , respectively, and $4.6 million and $14.1 million for the same periods in 2018.

Past Due Loans, Allowance For C

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS	9 Months Ended
	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS	PAST DUE LOANS, ALLOWANCE FOR CREDIT LOSSES, IMPAIRED LOANS, AND TDRS Past Due and Non-accrual Loans The following table presents an aging analysis of the Company 's past due loans as of September 30, 2019 and December 31, 2018 . The aging is determined without regard to accrual status. The table also presents non-performing loans, consisting of non-accrual loans (the majority of which are past due) and loans 90 days or more past due and still accruing interest, as of each balance sheet date. Aging Analysis of Past Due Loans and Non-performing Loans by Class (Dollar amounts in thousands) Aging Analysis (Accruing and Non-accrual) Non-performing Loans Current (1) 30-89 Days Past Due 90 Days or More Past Due Total Past Due Total Loans Non- accrual 90 Days or More Past Due, Still Accruing Interest As of September 30, 2019 Commercial and industrial $ 4,537,236 $ 20,929 $ 12,196 $ 33,125 $ 4,570,361 $ 26,739 $ 1,982 Agricultural 404,731 6,966 6,043 13,009 417,740 6,242 23 Commercial real estate: Office, retail, and industrial 1,869,816 7,289 15,772 23,061 1,892,877 26,812 — Multi-family 813,422 1,870 2,152 4,022 817,444 2,152 — Construction 635,270 1,771 215 1,986 637,256 152 63 Other commercial real estate 1,419,276 1,851 4,165 6,016 1,425,292 4,680 1,112 Total commercial real estate 4,737,784 12,781 22,304 35,085 4,772,869 33,796 1,175 Total corporate loans 9,679,751 40,676 40,543 81,219 9,760,970 66,777 3,180 Home equity 823,373 6,373 4,209 10,582 833,955 7,326 175 1-4 family mortgages 1,680,096 5,292 1,579 6,871 1,686,967 3,589 — Installment 488,592 1,533 1,302 2,835 491,427 — 1,302 Total consumer loans 2,992,061 13,198 7,090 20,288 3,012,349 10,915 1,477 Total loans $ 12,671,812 $ 53,874 $ 47,633 $ 101,507 $ 12,773,319 $ 77,692 $ 4,657 As of December 31, 2018 Commercial and industrial $ 4,085,164 $ 8,832 $ 26,297 $ 35,129 $ 4,120,293 $ 33,507 $ 422 Agricultural 428,357 940 1,631 2,571 430,928 1,564 101 Commercial real estate: Office, retail, and industrial 1,803,059 8,209 9,649 17,858 1,820,917 6,510 4,081 Multi-family 759,402 1,487 3,296 4,783 764,185 3,107 189 Construction 645,774 3,419 144 3,563 649,337 144 — Other commercial real estate 1,353,442 4,921 3,447 8,368 1,361,810 2,854 2,197 Total commercial real estate 4,561,677 18,036 16,536 34,572 4,596,249 12,615 6,467 Total corporate loans 9,075,198 27,808 44,464 72,272 9,147,470 47,686 6,990 Home equity 843,217 6,285 2,105 8,390 851,607 5,393 104 1-4 family mortgages 1,009,925 4,361 2,895 7,256 1,017,181 3,856 1,147 Installment 428,836 1,648 41 1,689 430,525 — 41 Total consumer loans 2,281,978 12,294 5,041 17,335 2,299,313 9,249 1,292 Total loans $ 11,357,176 $ 40,102 $ 49,505 $ 89,607 $ 11,446,783 $ 56,935 $ 8,282 (1) PCI loans with an accretable yield are considered current. Allowance for Credit Losses The Company maintains an allowance for credit losses at a level deemed adequate by management to absorb estimated losses inherent in the existing loan portfolio. See Note 1 , " Summary of Significant Accounting Policies ," for the accounting policy for the allowance for credit losses. A rollforward of the allowance for credit losses by portfolio segment for the quarters and nine months ended September 30, 2019 and 2018 is presented in the table below. Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Commercial, Industrial, and Agricultural Office, Retail, and Industrial Multi- family Construction Other Commercial Real Estate Consumer Reserve for Unfunded Commitments Total Allowance for Credit Losses Quarter Ended September 30, 2019 Beginning balance $ 66,364 $ 7,495 $ 2,159 $ 1,862 $ 4,997 $ 22,852 $ 1,200 $ 106,929 Charge-offs (7,176 ) (293 ) — — (184 ) (3,619 ) — (11,272 ) Recoveries 1,205 74 38 2 227 527 — 2,073 Net charge-offs (5,971 ) (219 ) 38 2 43 (3,092 ) — (9,199 ) Provision for loan losses and other 5,002 65 565 (98 ) 1,188 5,776 — 12,498 Ending balance $ 65,395 $ 7,341 $ 2,762 $ 1,766 $ 6,228 $ 25,536 $ 1,200 $ 110,228 Quarter Ended September 30, 2018 Beginning balance $ 60,043 $ 9,062 $ 2,175 $ 2,124 $ 4,631 $ 18,656 $ 1,000 $ 97,691 Charge-offs (6,277 ) (759 ) (1 ) (1 ) (177 ) (2,049 ) — (9,264 ) Recoveries 416 163 — 5 154 512 — 1,250 Net charge-offs (5,861 ) (596 ) (1 ) 4 (23 ) (1,537 ) — (8,014 ) Provision for loan losses and other 6,776 15 200 116 740 3,401 — 11,248 Ending balance $ 60,958 $ 8,481 $ 2,374 $ 2,244 $ 5,348 $ 20,520 $ 1,000 $ 100,925 Nine Months Ended September 30, 2019 Beginning balance $ 63,276 $ 7,900 $ 2,464 $ 2,173 $ 4,934 $ 21,472 $ 1,200 $ 103,419 Charge-offs (20,143 ) (2,526 ) (340 ) (6 ) (723 ) (9,735 ) — (33,473 ) Recoveries 3,764 235 39 18 293 1,500 — 5,849 Net charge-offs (16,379 ) (2,291 ) (301 ) 12 (430 ) (8,235 ) — (27,624 ) Provision for loan losses and other 18,498 1,732 599 (419 ) 1,724 12,299 — 34,433 Ending balance $ 65,395 $ 7,341 $ 2,762 $ 1,766 $ 6,228 $ 25,536 $ 1,200 $ 110,228 Nine Months Ended September 30, 2018 Beginning balance $ 55,791 $ 10,996 $ 2,534 $ 3,481 $ 6,381 $ 16,546 $ 1,000 $ 96,729 Charge-offs (29,609 ) (1,525 ) (5 ) (1 ) (247 ) (6,271 ) — (37,658 ) Recoveries 1,707 286 — 26 552 1,240 — 3,811 Net charge-offs (27,902 ) (1,239 ) (5 ) 25 305 (5,031 ) — (33,847 ) Provision for loan losses and other 33,069 (1,276 ) (155 ) (1,262 ) (1,338 ) 9,005 — 38,043 Ending balance $ 60,958 $ 8,481 $ 2,374 $ 2,244 $ 5,348 $ 20,520 $ 1,000 $ 100,925 The table below provides a breakdown of loans and the related allowance for credit losses by portfolio segment as of September 30, 2019 and December 31, 2018 . Loans and Related Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Loans Allowance for Credit Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment PCI Total Individually Evaluated for Impairment Collectively Evaluated for Impairment PCI Total As of September 30, 2019 Commercial, industrial, and agricultural $ 31,169 $ 4,907,442 $ 49,490 $ 4,988,101 $ 2,556 $ 62,465 $ 374 $ 65,395 Commercial real estate: Office, retail, and industrial 26,255 1,841,712 24,910 1,892,877 522 6,696 123 7,341 Multi-family 1,995 809,711 5,738 817,444 — 2,666 96 2,762 Construction 123 623,689 13,444 637,256 — 1,765 1 1,766 Other commercial real estate 3,657 1,372,354 49,281 1,425,292 95 4,579 1,554 6,228 Total commercial real estate 32,030 4,647,466 93,373 4,772,869 617 15,706 1,774 18,097 Total corporate loans 63,199 9,554,908 142,863 9,760,970 3,173 78,171 2,148 83,492 Consumer — 2,989,386 22,963 3,012,349 — 24,460 1,076 25,536 Reserve for unfunded commitments — — — — — 1,200 — 1,200 Total loans $ 63,199 $ 12,544,294 $ 165,826 $ 12,773,319 $ 3,173 $ 103,831 $ 3,224 $ 110,228 As of December 31, 2018 Commercial, industrial, and agricultural $ 32,415 $ 4,514,349 $ 4,457 $ 4,551,221 $ 3,961 $ 58,947 $ 368 $ 63,276 Commercial real estate: Office, retail, and industrial 5,057 1,799,304 16,556 1,820,917 748 5,984 1,168 7,900 Multi-family 3,492 747,030 13,663 764,185 — 2,154 310 2,464 Construction — 644,499 4,838 649,337 — 2,019 154 2,173 Other commercial real estate 1,545 1,305,444 54,821 1,361,810 — 4,180 754 4,934 Total commercial real estate 10,094 4,496,277 89,878 4,596,249 748 14,337 2,386 17,471 Total corporate loans 42,509 9,010,626 94,335 9,147,470 4,709 73,284 2,754 80,747 Consumer — 2,279,780 19,533 2,299,313 — 20,094 1,378 21,472 Reserve for unfunded commitments — — — — — 1,200 — 1,200 Total loans $ 42,509 $ 11,290,406 $ 113,868 $ 11,446,783 $ 4,709 $ 94,578 $ 4,132 $ 103,419 Loans Individually Evaluated for Impairment The following table presents loans individually evaluated for impairment by class of loan as of September 30, 2019 and December 31, 2018 . PCI loans are excluded from this disclosure. Impaired Loans Individually Evaluated by Class (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Recorded Investment In Recorded Investment In Loans with No Specific Reserve Loans with a Specific Reserve Unpaid Principal Balance Specific Reserve Loans with No Specific Reserve Loans with a Specific Reserve Unpaid Principal Balance Specific Reserve Commercial and industrial $ 10,600 $ 14,540 $ 50,231 $ 1,636 $ 7,550 $ 23,349 $ 49,102 $ 3,960 Agricultural 1,905 4,124 9,566 920 1,318 198 3,997 1 Commercial real estate: Office, retail, and industrial 16,440 9,815 38,296 522 1,861 3,196 6,141 748 Multi-family 1,995 — 1,995 — 3,492 — 3,492 — Construction 123 — 123 — — — — — Other commercial real estate 2,562 1,095 4,008 95 1,545 — 1,612 — Total commercial real estate 21,120 10,910 44,422 617 6,898 3,196 11,245 748 Total impaired loans individually evaluated for impairment $ 33,625 $ 29,574 $ 104,219 $ 3,173 $ 15,766 $ 26,743 $ 64,344 $ 4,709 The following table presents the average recorded investment and interest income recognized on impaired loans by class for the quarters and nine months ended September 30, 2019 and 2018 . PCI loans are excluded from this disclosure. Average Recorded Investment and Interest Income Recognized on Impaired Loans by Class (Dollar amounts in thousands) Quarters Ended September 30, 2019 2018 Average Interest Income Recognized (1) Average Interest Income Recognized (1) Commercial and industrial $ 21,111 $ 74 $ 28,082 $ 123 Agricultural 6,249 9 2,372 — Commercial real estate: Office, retail, and industrial 20,773 2 6,641 105 Multi-family 3,578 48 3,757 11 Construction 123 — — — Other commercial real estate 3,496 42 2,831 68 Total commercial real estate 27,970 92 13,229 184 Total impaired loans $ 55,330 $ 175 $ 43,683 $ 307 Nine Months Ended September 30, 2019 2018 Average Interest (1) Average Interest (1) Commercial and industrial $ 26,275 $ 100 $ 34,440 $ 159 Agricultural 4,032 20 2,153 25 Commercial real estate: Office, retail, and industrial 15,611 6 8,867 873 Multi-family 3,456 48 2,132 66 Construction 62 — — — Other commercial real estate 2,517 84 2,338 181 Total commercial real estate 21,646 138 13,337 1,120 Total impaired loans $ 51,953 $ 258 $ 49,930 $ 1,304 (1) Recorded using the cash basis of accounting. Credit Quality Indicators Corporate loans and commitments are assessed for credit risk and assigned ratings based on various characteristics, such as the borrower's cash flow, leverage, and collateral. Ratings for commercial credits are reviewed periodically. The following tables present credit quality indicators by class for corporate and consumer loans, as of September 30, 2019 and December 31, 2018 . Corporate Credit Quality Indicators by Class (Dollar amounts in thousands) Pass Special Mention (1)(4) Substandard (2)(4) Non-accrual (3) Total As of September 30, 2019 Commercial and industrial $ 4,404,464 $ 63,434 $ 75,724 $ 26,739 $ 4,570,361 Agricultural 373,757 22,495 15,246 6,242 417,740 Commercial real estate: Office, retail, and industrial 1,793,811 41,332 30,922 26,812 1,892,877 Multi-family 799,218 10,068 6,006 2,152 817,444 Construction 612,810 14,147 10,147 152 637,256 Other commercial real estate 1,352,801 33,893 33,918 4,680 1,425,292 Total commercial real estate 4,558,640 99,440 80,993 33,796 4,772,869 Total corporate loans $ 9,336,861 $ 185,369 $ 171,963 $ 66,777 $ 9,760,970 As of December 31, 2018 Commercial and industrial $ 3,952,066 $ 74,878 $ 59,842 $ 33,507 $ 4,120,293 Agricultural 407,542 10,070 11,752 1,564 430,928 Commercial real estate: Office, retail, and industrial 1,735,426 35,853 43,128 6,510 1,820,917 Multi-family 745,131 9,273 6,674 3,107 764,185 Construction 624,446 16,370 8,377 144 649,337 Other commercial real estate 1,294,128 47,736 17,092 2,854 1,361,810 Total commercial real estate 4,399,131 109,232 75,271 12,615 4,596,249 Total corporate loans $ 8,758,739 $ 194,180 $ 146,865 $ 47,686 $ 9,147,470 (1) Loans categorized as special mention exhibit potential weaknesses that require the close attention of management since these potential weaknesses may result in the deterioration of repayment prospects in the future. (2) Loans categorized as substandard exhibit well-defined weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well-secured, and collection of principal and interest is expected within a reasonable time. (3) Loans categorized as non-accrual exhibit well-defined weaknesses that may jeopardize the liquidation of the debt or result in a loss if the deficiencies are not corrected. (4) Total special mention and substandard loans includes accruing TDR s of $232,000 as of September 30, 2019 and $630,000 as of December 31, 2018 . Consumer Credit Quality Indicators by Class (Dollar amounts in thousands) Performing Non-accrual Total As of September 30, 2019 Home equity $ 826,629 $ 7,326 $ 833,955 1-4 family mortgages 1,683,378 3,589 1,686,967 Installment 491,427 — 491,427 Total consumer loans $ 3,001,434 $ 10,915 $ 3,012,349 As of December 31, 2018 Home equity $ 846,214 $ 5,393 $ 851,607 1-4 family mortgages 1,013,325 3,856 1,017,181 Installment 430,525 — 430,525 Total consumer loans $ 2,290,064 $ 9,249 $ 2,299,313 TDR s TDR s are generally performed at the request of the individual borrower and may include forgiveness of principal, reduction in interest rates, changes in payments, and maturity date extensions. The table below presents TDR s by class as of September 30, 2019 and December 31, 2018 . See Note 1, "Summary of Significant Accounting Policies," for the accounting policy for TDR s. TDR s by Class (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Accruing Non-accrual (1) Total Accruing Non-accrual (1) Total Commercial and industrial $ 232 $ 4,561 $ 4,793 $ 246 $ 5,994 $ 6,240 Agricultural — — — — — — Commercial real estate: Office, retail, and industrial — — — — — — Multi-family 165 — 165 557 — 557 Construction — — — — — — Other commercial real estate 173 — 173 181 — 181 Total commercial real estate 338 — 338 738 — 738 Total corporate loans 570 4,561 5,131 984 5,994 6,978 Home equity 107 249 356 113 327 440 1-4 family mortgages 745 278 1,023 769 291 1,060 Installment — — — — — — Total consumer loans 852 527 1,379 882 618 1,500 Total loans $ 1,422 $ 5,088 $ 6,510 $ 1,866 $ 6,612 $ 8,478 (1) These TDR s are included in non-accrual loans in the preceding tables. TDR s are included in the calculation of the allowance for credit losses in the same manner as impaired loans. As of September 30, 2019 and December 31, 2018 , there were no specific reserves related to TDR s. There were no material restructurings during the quarters and nine months ended September 30, 2019 and 2018 . Accruing TDR s that do not perform in accordance with their modified terms are transferred to non-accrual. There were no material TDR s that defaulted within twelve months of the restructure date during the quarters and nine months ended September 30, 2019 and 2018 . A rollforward of the carrying value of TDR s for the quarters and nine months ended September 30, 2019 and 2018 is presented in the following table. TDR Rollforward (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Accruing Beginning balance $ 1,441 $ 1,760 $ 1,866 $ 1,796 Additions — — 12 — Net payments (19 ) (19 ) (73 ) (55 ) Net transfers to non-accrual — — (383 ) — Ending balance 1,422 1,741 1,422 1,741 Non-accrual Beginning balance 7,841 8,238 6,612 24,533 Additions — — — 355 Net payments (2,753 ) (1,620 ) (1,279 ) (14,598 ) Charge-offs — (253 ) (628 ) (3,925 ) Net transfers from accruing — — 383 — Ending balance 5,088 6,365 5,088 6,365 Total TDRs $ 6,510 $ 8,106 $ 6,510 $ 8,106 There were $1.6 million and $3.8 million of commitments to lend additional funds to borrowers with TDR s as of September 30, 2019 and December 31, 2018 , respectively.

Lease Obligations Lease Obligat

Lease Obligations Lease Obligations	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lease Obligations	LEASE OBLIGATIONS The Company has the right to utilize certain premises under non-cancelable operating leases with varying maturity dates through the year ending December 31, 2033 . As of September 30, 2019 , the weighted-average remaining lease term on these leases was 10.79 years. Various leases contain renewal or termination options controlled by the Company or options to purchase the leased property during or at the expiration of the lease period at specific prices. Some leases contain escalation clauses calling for rentals to be adjusted for increased real estate taxes and other operating expenses or proportionately adjusted for increases in consumer or other price indices. Variable payments for real estate taxes and other operating expenses are considered to be non-lease components and are excluded from the determination of the lease liability. In addition, the Company rents or subleases certain real estate to third-parties. The following summary reflects the future minimum payments by year required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year and a reconciliation of those payments to the Company's lease liability as of September 30, 2019 . Lease Liability (Dollar amounts in thousands) As of Year Ending December 31, 2019 $ 4,059 2020 17,736 2021 17,611 2022 17,618 2023 17,752 2024 and thereafter 115,842 Total minimum lease payments 190,618 Discount (1) (30,783 ) Lease liability (2) $ 159,835 (1) Represents the net present value adjustment related to minimum lease payments. (2) Included in accrued interest payable and other liabilities in the Consolidated Statements of Financial Condition. The discount rate for the Company's operating leases is the rate implicit in the lease and, if that rate cannot be readily determined, the Company's incremental borrowing rate. The weighted-average discount rate on the Company's operating leases was 3.20% as of September 30, 2019 . As of September 30, 2019 , right-of-use assets of $139.5 million associated with lease liabilities were included in accrued interest receivable and other assets in the Consolidated Statements of Financial Condition. The following table presents net operating lease expense for the quarters and nine months ended September 30, 2019 and 2018 . Net Operating Lease Expense (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Lease expense charged to operations $ 4,467 $ 4,730 $ 12,953 $ 14,673 Accretion of operating lease intangible (1) — (211 ) — (716 ) Accretion of deferred gain on sale-leaseback transaction (1) — (1,463 ) — (4,389 ) Rental income from premises leased to others (1) (203 ) (122 ) (525 ) (384 ) Net operating lease expense $ 4,264 $ 2,934 $ 12,428 $ 9,184 (1) Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income. During 2016, the Bank completed a sale-leaseback transaction, whereby the Bank sold to a third-party 55 branches and concurrently entered into triple net lease agreements with certain affiliates of the third-party for each of the branches sold. The sale-leaseback transaction resulted in a pre-tax gain of $88.0 million , net of transaction related expenses, of which $5.5 million was immediately recognized in earnings. Remaining deferred pre-tax gains were $65.5 million as of December 31, 2018. Upon adoption of new lease guidance on January 1, 2019, the remaining after-tax gain of $47.3 million was recognized as a cumulative-effect adjustment to equity in the Consolidated Statements of Financial Condition. For additional detail regarding the new lease guidance see Note 2, "Recent Accounting Pronouncements."

Material Transactions Affecting

Material Transactions Affecting Stockholders' Equity	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Material Transactions Affecting Stockholders' Equity	MATERIAL TRANSACTIONS AFFECTING STOCKHOLDERS' EQUITY On March 19, 2019 , the Company announced a new stock repurchase program that authorizes the Company to repurchase up to $180 million of its common stock. Stock repurchases under this program may be made from time to time on the open market or in privately negotiated transactions, at the discretion of the Company. The program will be in effect for a one -year period, with repurchases made at prices to be determined by the Company. The stock repurchase program does not obligate the Company to repurchase a specific dollar amount or number of shares, and the program may be extended, modified, or discontinued at any time. The Company repurchased 645,000 and 1.7 million shares of its common stock at a total cost of $12.7 million and $33.9 million during the quarter and nine months ended September 30, 2019 , respectively.

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 The table below displays the calculation of basic and diluted earnings per common share (" EPS "). Basic and Diluted EPS (Amounts in thousands, except per share data) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Net income $ 54,545 $ 53,352 $ 147,617 $ 116,462 Net income applicable to non-vested restricted shares (465 ) (441 ) (1,257 ) (992 ) Net income applicable to common shares $ 54,080 $ 52,911 $ 146,360 $ 115,470 Weighted-average common shares outstanding: Weighted-average common shares outstanding (basic) 109,281 102,178 107,852 102,087 Dilutive effect of common stock equivalents 381 — 394 5 Weighted-average diluted common shares outstanding 109,662 102,178 108,246 102,092 Basic EPS $ 0.49 $ 0.52 $ 1.36 $ 1.13 Diluted EPS $ 0.49 $ 0.52 $ 1.35 $ 1.13 Anti-dilutive shares not included in the computation of diluted EPS (1) — — — 36 (1) This amount represents outstanding stock options for which the exercise price is greater than the average market price of the Company's common stock. The final outstanding stock options were exercised during the first quarter of 2018.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES In the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy. The significant accounting policies related to derivative instruments and hedging activities are presented in Note 1, "Summary of Significant Accounting Policies." Cash Flow Hedges As of September 30, 2019 , the Company hedged $815.0 million of certain corporate variable rate loans using interest rate swaps through which the Company receives fixed amounts and pays variable amounts. The Company also hedged $1.1 billion of borrowed funds using forward starting interest rate swaps through which the Company receives variable amounts and pays fixed amounts. These transactions allow the Company to add stability to net interest income and manage its exposure to interest rate movements. Forward starting interest rate swaps totaling $510.0 million began on various dates between February of 2017 and September of 2019 and mature between February of 2020 and September of 2022. The remaining forward starting interest rate swaps totaling $555.0 million begin at various dates between October of 2019 and February of 2021 and mature between October of 2021 and August of 2024. The weighted-average fixed interest rate to be paid on these interest rate swaps that have not yet begun was 2.16% as of September 30, 2019 . These derivative contracts are designated as cash flow hedges. Cash Flow Hedges (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Gross notional amount outstanding $ 1,880,000 $ 2,280,000 Derivative asset fair value in other assets (1) 2,059 6,889 Derivative liability fair value in other liabilities (1) (205 ) (11,328 ) Weighted-average interest rate received 2.02 % 2.12 % Weighted-average interest rate paid 1.97 % 2.20 % Weighted-average maturity (in years) 1.41 1.53 (1) Certain cash flow hedges are transacted through a clearinghouse ("centrally cleared") and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. Changes in the fair value of cash flow hedges are recorded in accumulated other comprehensive income (loss) on an after-tax basis and are subsequently reclassified to interest income or expense in the period that the forecasted hedged item impacts earnings. As of September 30, 2019 , the Company estimates that $1.4 million will be reclassified from accumulated other comprehensive income (loss) as an increase to interest income over the next twelve months. Other Derivative Instruments The Company also enters into derivative transactions through capital market products with its commercial customers and simultaneously enters into an offsetting interest rate derivative transaction with third-parties. This transaction allows the Company's customers to effectively convert a variable rate loan into a fixed rate loan. Due to the offsetting nature of these transactions, the Company does not apply hedge accounting treatment. The Company's credit exposure on these derivative transactions results primarily from counterparty credit risk. The credit valuation adjustment (" CVA ") is a fair value adjustment to the derivative to account for this risk. As of September 30, 2019 and December 31, 2018 , the Company's credit exposure was fully secured by the underlying collateral on customer loans and mitigated through netting arrangements with third-parties; therefore, no CVA was recorded. Capital market products income related to commercial customer derivative instruments totaled $4.2 million and $7.6 million for the quarter and nine months ended September 30, 2019 , respectively, and $1.9 million and $6.3 million for the quarter and nine months ended September 30, 2018 , respectively. Other Derivative Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Gross notional amount outstanding $ 3,738,566 $ 3,085,226 Derivative asset fair value in other assets (1) 80,156 25,168 Derivative liability fair value in other liabilities (1) (25,137 ) (17,533 ) Fair value of derivative (2) 25,346 18,013 (1) Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. (2) This amount represents the fair value if credit risk related contingent features were triggered. The Company occasionally enters into risk participation agreements with counterparty banks to transfer or assume a portion of the credit risk related to customer transactions. The amounts of these instruments were not material for any periods presented. The Company had no other derivative instruments as of September 30, 2019 and December 31, 2018 . The Company does not enter into derivative transactions for purely speculative purposes. The following table presents the impact of derivative instruments on comprehensive income and the reclassification of gains (losses) from accumulated other comprehensive loss to net interest income for the quarters and nine months ended September 30, 2019 and 2018 . Cash Flow Hedge Accounting on AOCI (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Gains (losses) recognized in other comprehensive income Interest rate swaps in interest income $ 2,218 $ 2,578 $ 11,515 $ 13,151 Interest rate swaps in interest expense (1,625 ) (1,577 ) (13,621 ) (11,620 ) Reclassification of gains (losses) included in net income Interest rate swaps in interest income $ 824 $ 857 $ 3,572 $ 1,504 Interest rate swaps in interest expense (1,018 ) (978 ) (4,966 ) (2,087 ) The following table presents the impact of derivative instruments on net interest income for the quarters and nine months ended September 30, 2019 and 2018 . Hedge Income (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Cash Flow Hedges Interest rate swaps in interest income $ 824 $ 857 $ 3,572 $ 1,504 Interest rate swaps in interest expense (1,018 ) (978 ) (4,966 ) (2,087 ) Total cash flow hedges $ (194 ) $ (121 ) $ (1,394 ) $ (583 ) Credit Risk Derivative instruments are inherently subject to credit risk, which represents the Company's risk of loss when the counterparty to a derivative contract fails to perform according to the terms of the agreement. Credit risk is managed by limiting and collateralizing the aggregate amount of net unrealized losses by transaction, monitoring the size and the maturity structure of the derivatives, and applying uniform credit standards. Company policy establishes limits on credit exposure to any single counterparty. In addition, the Company established bilateral collateral agreements with derivative counterparties that provide for exchanges of marketable securities or cash to collateralize either party's net losses above a stated minimum threshold. As of September 30, 2019 and December 31, 2018 , these collateral agreements covered 100% of the fair value of the Company's outstanding fair value hedges. Derivative assets and liabilities are presented gross, rather than net, of pledged collateral amounts. Certain derivative instruments are subject to master netting agreements with counterparties. The Company records these transactions at their gross fair values and does not offset derivative assets and liabilities in the Consolidated Statements of Financial Condition. The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2019 and December 31, 2018 . Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Assets Liabilities Assets Liabilities Gross amounts recognized $ 82,215 $ 25,342 $ 32,057 $ 28,861 Less: amounts offset in the Consolidated Statements of Financial Condition — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 82,215 25,342 32,057 28,861 Gross amounts not offset in the Consolidated Statements of Financial Condition: Offsetting derivative positions (3,668 ) (3,668 ) (11,678 ) (11,678 ) Cash collateral pledged — (16,557 ) (9,060 ) (3,506 ) Net credit exposure $ 78,547 $ 5,117 $ 11,319 $ 13,677 (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition. As of September 30, 2019 and December 31, 2018 , the Company's derivative instruments generally contained provisions that require the Company's debt to remain above a certain credit rating by each of the major credit rating agencies or that the Company maintain certain capital levels. If the Company's debt were to fall below that credit rating or the Company's capital were to fall below the required levels, it would be in violation of those provisions, and the counterparties to the derivative instruments could terminate the swap transaction and demand cash settlement of the derivative instrument in an amount equal to the derivative liability fair value. As of September 30, 2019 and December 31, 2018 the Company was in compliance with these provisions.

Commitments, Guarantees, and Co

Commitments, Guarantees, and Contingent Liabilities	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Guarantees, and Contingent Liabilities	COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES Credit Commitments and Guarantees In the normal course of business, the Company enters into a variety of financial instruments with off-balance sheet risk to meet the financing needs of its customers and to conduct lending activities, including commitments to extend credit as well as standby and commercial letters of credit. These instruments involve elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Statements of Financial Condition. Contractual or Notional Amounts of Financial Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Commitments to extend credit: Commercial, industrial, and agricultural $ 1,748,889 $ 1,729,286 Commercial real estate 327,821 296,882 Home equity 571,389 570,553 Other commitments (1) 254,689 244,917 Total commitments to extend credit $ 2,902,788 $ 2,841,638 Letters of credit $ 104,286 $ 112,728 (1) Other commitments includes installment and overdraft protection program commitments. Commitments to extend credit are agreements to lend funds to a customer, subject to contractual terms and covenants. Commitments generally have fixed expiration dates or other termination clauses, variable interest rates, and fee requirements, when applicable. Since many of the commitments are expected to expire without being drawn, the total commitment amounts do not necessarily represent future cash flow requirements. In the event of a customer's non-performance, the Company's credit loss exposure is equal to the contractual amount of the commitments. The credit risk is essentially the same as extending loans to customers for the full contractual amount. The Company uses the same credit policies for credit commitments as its loans and minimizes exposure to credit loss through various collateral requirements. Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third-party. Letters of credit generally are contingent on the failure of the customer to perform according to the terms of the contract with the third-party and are often issued in favor of a municipality where construction is taking place to ensure the borrower adequately completes the construction. Commercial letters of credit are issued to facilitate transactions between a customer and a third-party based on agreed upon terms. The maximum potential future payments guaranteed by the Company under letters of credit arrangements are equal to the contractual amount of the commitment. If a commitment is funded, the Company may seek recourse through the liquidation of the underlying collateral, including real estate, production plants and property, marketable securities, or receipt of cash. As a result of the sale of certain 1-4 family mortgage loans, the Company is contractually obligated to repurchase early payment default loans or loans that do not meet underwriting requirements at recorded value. In accordance with the sales agreements, there is no limitation to the maximum potential future payments or expiration of the Company's recourse obligation. There were no material loan repurchases during the quarters and nine months ended September 30, 2019 and 2018 . Legal Proceedings In the ordinary course of business, there were certain legal proceedings pending against the Company and its subsidiaries at September 30, 2019

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value represents the amount expected to be received to sell an asset or paid to transfer a liability in its principal or most advantageous market in an orderly transaction between market participants at the measurement date. In accordance with fair value accounting guidance, the Company measures, records, and reports various types of assets and liabilities at fair value on either a recurring or non-recurring basis in the Consolidated Statements of Financial Condition. Those assets and liabilities are presented below in the sections titled "Assets and Liabilities Required to be Measured at Fair Value on a Recurring Basis" and "Assets and Liabilities Required to be Measured at Fair Value on a Non-Recurring Basis." Other assets and liabilities are not required to be measured at fair value in the Consolidated Statements of Financial Condition, but must be disclosed at fair value. See the "Fair Value Measurements of Other Financial Instruments" section of this note. Any aggregation of the estimated fair values presented in this note does not represent the value of the Company. Depending on the nature of the asset or liability, the Company uses various valuation methodologies and assumptions to estimate fair value. GAAP provides a three-tiered fair value hierarchy based on the inputs used to measure fair value. The hierarchy is defined as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Observable inputs other than level 1 prices, such as quoted prices for similar instruments, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs require significant management judgment or estimation, some of which use model-based techniques and may be internally developed. Assets and liabilities are assigned to a level within the fair value hierarchy based on the lowest level of significant input used to measure fair value. Assets and liabilities may change levels within the fair value hierarchy due to market conditions or other circumstances. Those transfers are recognized on the date of the event that prompted the transfer. There were no transfers of assets or liabilities required to be measured at fair value on a recurring basis between levels of the fair value hierarchy during the periods presented. Assets and Liabilities Required to be Measured at Fair Value on a Recurring Basis The following table provides the fair value for assets and liabilities required to be measured at fair value on a recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Equity securities $ 22,511 $ 13,174 $ — $ 19,658 $ 11,148 $ — Securities available-for-sale U.S. treasury securities 41,085 — — 37,767 — — U.S. agency securities — 244,087 — — 142,563 — CMOs — 1,590,553 — — 1,315,209 — MBSs — 677,507 — — 466,934 — Municipal securities — 237,434 — — 227,187 — Corporate debt securities — 115,072 — — 82,349 — Total securities available-for-sale 41,085 2,864,653 — 37,767 2,234,242 — Mortgage servicing rights ("MSRs") (1) — — 5,682 — — 6,730 Derivative assets (1) — 82,215 — — 32,057 — Liabilities Derivative liabilities (2) $ — $ 25,342 $ — $ — $ 28,861 $ — (1) Included in other assets in the Consolidated Statements of Financial Condition. (2) Included in other liabilities in the Consolidated Statements of Financial Condition. The following sections describe the specific valuation techniques and inputs used to measure financial assets and liabilities at fair value. Equity Securities The Company's equity securities consist primarily of community development investments and certain diversified investment securities held in a grantor trust for participants in the Company's nonqualified deferred compensation plan that are invested in money market and mutual funds. The fair value of certain community development investments is based on quoted prices in active markets or market prices for similar securities obtained from external pricing services or dealer market participants and is classified in level 2 of the fair value hierarchy. As of September 30, 2019 , the fair value of certain community development investments totaling $5.0 million was based on the net asset value per share ("NAV") practical expedient and can be redeemed at any month end with 30 days notice. Since these investments are measured at fair value using the NAV practical expedient, they are not classified in the fair value hierarchy. The fair value of the money market and mutual funds is based on quoted market prices in active exchange markets and is classified in level 1 of the fair value hierarchy. Securities Available-for-Sale The Company's securities available-for-sale are primarily fixed income instruments that are not quoted on an exchange but may be traded in active markets. The fair values for these securities are based on quoted prices in active markets or market prices for similar securities obtained from external pricing services or dealer market participants and are classified in level 2 of the fair value hierarchy. The fair value of U.S. treasury securities is based on quoted market prices in active exchange markets and is classified in level 1 of the fair value hierarchy. Quarterly, the Company evaluates the methodologies used by its external pricing services to estimate the fair value of these securities in order to determine whether the valuations represent an exit price in the Company's principal markets. MSR s The Company services loans for others totaling $652.2 million and $627.3 million as of September 30, 2019 and December 31, 2018 , respectively. These loans are owned by third-parties and are not included in the Consolidated Statements of Financial Condition. The Company determines the fair value of MSR s by estimating the present value of expected future cash flows associated with the mortgage loans being serviced and classifies them in level 3 of the fair value hierarchy. The following table presents the ranges of significant, unobservable inputs used by the Company to determine the fair value of MSR s as of September 30, 2019 and December 31, 2018 . Significant Unobservable Inputs Used in the Valuation of MSR s As of September 30, 2019 December 31, 2018 Prepayment speed 6.0 % - 10.6% 6.5 % - 13.5% Maturity (months) 17 - 89 20 - 104 Discount rate 9.0 % - 12.0% 9.5 % - 12.0% The impact of changes in these key inputs could result in a significantly higher or lower fair value measurement for MSR s. Significant increases in expected prepayment speeds and discount rates have negative impacts on the valuation. Higher maturity assumptions have a favorable effect on the estimated fair value. A rollforward of the carrying value of MSR s for the quarters and nine months ended September 30, 2019 and 2018 is presented in the following table. Carrying Value of MSR s (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Beginning balance $ 5,831 $ 6,671 $ 6,730 $ 5,894 New MSRs 404 324 861 893 Total gains (losses) included in earnings (1) : Changes in valuation inputs and assumptions (284 ) 65 (1,273 ) 627 Other changes in fair value (2) (269 ) (243 ) (636 ) (597 ) Ending balance (3) $ 5,682 $ 6,817 $ 5,682 $ 6,817 Contractual servicing fees earned (1) $ 404 $ 375 $ 1,175 $ 1,122 (1) Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2019 and 2018 . (2) Primarily represents changes in expected future cash flows due to payoffs and paydowns. (3) Included in other assets in the Consolidated Statements of Financial Condition. Derivative Assets and Derivative Liabilities The Company enters into interest rate swaps and derivative transactions with commercial customers. These derivative transactions are executed in the dealer market, and pricing is based on market quotes obtained from the counterparties. The market quotes were developed using market observable inputs, which primarily include LIBOR. Therefore, derivatives are classified in level 2 of the fair value hierarchy. For its derivative assets and liabilities, the Company also considers non-performance risk, including the likelihood of default by itself and its counterparties, when evaluating whether the market quotes from the counterparty are representative of an exit price. Assets and Liabilities Required to be Measured at Fair Value on a Non-Recurring Basis The following table provides the fair value for each class of assets and liabilities required to be measured at fair value on a non-recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Non-Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Collateral-dependent impaired loans (1) $ — $ — $ 35,984 $ — $ — $ 24,565 OREO (2) — — 3,461 — — 6,012 Loans held-for-sale (3) — — 47,455 — — 3,478 Assets held-for-sale (4) — — 8,626 — — 3,722 (1) Includes impaired loans with charge-offs and impaired loans with a specific reserve during the periods presented. (2) Includes OREO with fair value adjustments subsequent to initial transfer that occurred during the periods presented. (3) Included in other assets in the Consolidated Statements of Financial Condition. (4) Included in premises, furniture, and equipment in the Consolidated Statements of Financial Condition. Collateral-Dependent Impaired Loans Certain collateral-dependent impaired loans are subject to fair value adjustments to reflect the difference between the carrying value of the loan and the value of the underlying collateral. The fair values of collateral-dependent impaired loans are primarily determined by current appraised values of the underlying collateral. Based on the age and/or type, appraisals may be adjusted in the range of 0% to 15% . In certain cases, an internal valuation may be used when the underlying collateral is located in areas where comparable sales data is limited or unavailable. Accordingly, collateral-dependent impaired loans are classified in level 3 of the fair value hierarchy. Collateral-dependent impaired loans for which the fair value is greater than the recorded investment are not measured at fair value in the Consolidated Statements of Financial Condition and are not included in this disclosure. OREO The fair value of OREO is measured using the current appraised value of the properties. In certain circumstances, a current appraisal may not be available or may not represent an accurate measurement of the property's fair value due to outdated market information or other factors. In these cases, the fair value is determined based on the lower of the (i) most recent appraised value, (ii) broker price opinion, (iii) current listing price, or (iv) signed sales contract. Given these valuation methods, OREO is classified in level 3 of the fair value hierarchy. Loans Held-for-Sale As of September 30, 2019 and December 31, 2018 , loans held-for-sale consists of 1-4 family mortgage loans, which were originated with the intent to sell. These loans were recorded in the held-for-sale category at the contract price and, accordingly, are classified in level 3 of the fair value hierarchy. Assets Held-for-Sale Assets held-for-sale as of September 30, 2019 and December 31, 2018 consists of former branches that are no longer in operation and parcels of land previously purchased for expansion. These properties are being actively marketed and were transferred into the held-for-sale category at their fair value as determined by current appraisals. Based on these valuation methods, they are classified in level 3 of the fair value hierarchy. Financial Instruments Not Required to be Measured at Fair Value For certain financial instruments that are not required to be measured at fair value in the Consolidated Statements of Financial Condition, the Company must disclose the estimated fair values and the level within the fair value hierarchy as shown in the following table. Fair Value Measurements of Other Financial Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Assets Cash and due from banks 1 $ 273,613 $ 273,613 $ 211,189 $ 211,189 Interest-bearing deposits in other banks 2 202,054 202,054 78,069 78,069 Securities held-to-maturity 2 22,566 21,982 10,176 9,871 FHLB and FRB stock 2 112,845 112,845 80,302 80,302 Loans 3 12,665,485 12,561,148 11,346,668 11,052,040 Investment in BOLI 3 297,610 297,610 296,733 296,733 Accrued interest receivable 3 58,223 58,223 54,847 54,847 Liabilities Deposits 2 $ 13,440,927 $ 13,438,885 $ 12,084,112 $ 12,064,604 Borrowed funds 2 1,653,490 1,653,490 906,079 906,079 Senior and subordinated debt 2 233,743 276,715 203,808 211,207 Accrued interest payable 2 12,000 12,000 10,005 10,005 Management uses various methodologies and assumptions to determine the estimated fair values of the financial instruments in the table above. The fair value estimates are made at a discrete point in time based on relevant market information and consider management's judgments regarding future expected economic conditions, loss experience, and specific risk characteristics of the financial instruments. Loans include the FDIC indemnification asset and net loans, which consists of loans held-for-investment, acquired loans, and the allowance for loan losses. As of both September 30, 2019 and December 31, 2018 , the Company estimated the fair value of lending commitments outstanding to be immaterial.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation – The accompanying unaudited condensed consolidated interim financial statements ("consolidated financial statements") of First Midwest Bancorp, Inc. (the " Company "), a Delaware corporation, were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (" SEC ") for quarterly reports on Form 10-Q and reflect all adjustments that management deems necessary for the fair presentation of the financial position and results of operations for the periods presented. The results of operations for the quarter and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles (" GAAP ") and general practices within the banking industry. The accompanying consolidated financial statements do not include certain information and note disclosures required by GAAP for complete annual financial statements. Therefore, these financial statements should be read in conjunction with the Company 's 2018 Annual Report on Form 10-K (" 2018 10-K"). The Company
Reclassification	Certain reclassifications were made to prior year amounts to conform to the current year presentation.
Use of Estimates	Use of Estimates – The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates.
Principles of Consolidation	Principles of Consolidation – The accompanying consolidated financial statements include the financial position and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries and are not included in the consolidated financial statements.
Business Combinations	Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Assets acquired and liabilities assumed are recorded at their estimated fair values as of the date of acquisition, with any excess of the purchase price of the acquisition over the fair value of the identifiable net tangible and intangible assets acquired recorded as goodwill. Alternatively, a gain is recorded if the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. The results of operations of the acquired business are included in the Condensed Consolidated Statements of Income from the effective date of the acquisition.
Loans	Loans – Loans held-for-investment are loans that the Company intends to hold until they are paid in full and are carried at the principal amount outstanding, including certain net deferred loan origination fees. Loan origination fees, commitment fees, and certain direct loan origination costs are deferred, and the net amount is amortized as a yield adjustment over the contractual life of the related loans or commitments and included in interest income. Fees related to letters of credit are amortized into fee income over the contractual life of the commitment. Other credit-related fees are recognized as fee income when earned. The Company 's net investment in direct financing leases is included in loans and consists of future minimum lease payments and estimated residual values, net of unearned income. Interest income on loans is accrued based on principal amounts outstanding. Loans held-for-sale are carried at the lower of aggregate cost or fair value and included in other assets in the Consolidated Statements of Financial Condition.
Acquired and Covered Loans	Acquired and Covered Loans – Covered loans consists of loans acquired by the Company in Federal Deposit Insurance Corporation (" FDIC ")-assisted transactions that are covered by loss share agreements with the FDIC (the " FDIC Agreements "), under which the FDIC reimburses the Company for the majority of the losses and eligible expenses related to these assets during the coverage period. Acquired loans consist of all other loans that were acquired in business combinations that are not covered by the FDIC Agreements. Certain loans that were previously classified as covered loans are no longer covered under the FDIC Agreements, and are included in acquired loans. Covered loans and acquired loans are included within loans held-for-investment. Acquired and covered loans are separated into (i) non-purchased credit impaired (" non-PCI ") loans and (ii) purchased credit impaired (" PCI ") loans. Non-PCI loans include loans that did not have evidence of credit deterioration since origination at the acquisition date. PCI loans include loans that had evidence of credit deterioration since origination and for which it was probable at acquisition that the Company would not collect all contractually required principal and interest payments. Evidence of credit deterioration was evaluated using various indicators, such as past due and non-accrual status. Leases and revolving loans do not qualify to be accounted for as PCI loans and are accounted for as non-PCI loans. The acquisition adjustment related to non-PCI loans is amortized into interest income over the contractual life of the related loans. If an acquired non-PCI loan is renewed subsequent to the acquisition date, any remaining acquisition adjustment is accreted into interest income and the loan is considered a new loan that is no longer classified as an acquired loan. PCI loans are accounted for based on estimates of expected future cash flows. To estimate the fair value, the Company generally aggregates purchased consumer loans and commercial loans into pools of loans with common risk characteristics, such as delinquency status, credit score, and internal risk ratings. The fair values of larger balance commercial loans are estimated on an individual basis. Expected future cash flows in excess of the fair value of loans at the purchase date ("accretable yield") are recorded as interest income over the life of the loans if the timing and amount of the expected future cash flows can be reasonably estimated. The non-accretable yield represents the difference between contractually required payments and the expected future cash flows determined at acquisition. Subsequent increases in expected future cash flows are offset against the allowance for credit losses to the extent an allowance has been established or otherwise recognized as interest income prospectively. The present value of any decreases in expected future cash flows is recognized by recording a charge-off through the allowance for loan losses or providing an allowance for loan losses.
90-Days Past Due Loans	90-Days Past Due Loans – The Company 's accrual of interest on loans is generally discontinued at the time the loan is 90 days past due unless the credit is sufficiently collateralized and in the process of renewal or collection.
Non-accrual Loans	Non-accrual Loans – Generally, corporate loans are placed on non-accrual status (i) when either principal or interest payments become 90 days or more past due unless the credit is sufficiently collateralized and in the process of renewal or collection, or (ii) when an individual analysis of a borrower's creditworthiness warrants a downgrade to non-accrual regardless of past due status. When a loan is placed on non-accrual status, unpaid interest credited to income in the current year is reversed, and unpaid interest accrued in prior years is charged against the allowance for loan losses. After the loan is placed on non-accrual status, all debt service payments are applied to the principal on the loan. Future interest income may only be recorded on a cash basis after recovery of principal is reasonably assured. Non-accrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate that the Company will collect all principal and interest. Commercial loans and loans secured by real estate are charged-off when deemed uncollectible. A loss is recorded if the net realizable value of the underlying collateral is less than the outstanding principal and interest. Consumer loans that are not secured by real estate are subject to mandatory charge-off at a specified delinquency date and are usually not classified as non-accrual prior to being charged-off. Closed-end consumer loans, which include installment, automobile, and single payment loans, are usually charged-off no later than the end of the month in which the loan becomes 120 days past due. PCI loans are generally considered accruing loans unless reasonable estimates of the timing and amount of expected future cash flows cannot be determined. Loans without reasonable future cash flow estimates are classified as non-accrual loans, and interest income is not recognized on those loans until the timing and amount of the expected future cash flows can be reasonably determined.
Troubled Debt Restructurings (“TDRs”)	Troubled Debt Restructurings ( " TDR s" ) – A restructuring is considered a TDR when (i) the borrower is experiencing financial difficulties, and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity date. Loans are not classified as TDR s when the modification is short-term or results in an insignificant delay in payments. The Company 's TDR s are determined on a case-by-case basis. The Company does not accrue interest on a TDR unless it believes collection of all principal and interest under the modified terms is reasonably assured. For a TDR to begin accruing interest, the borrower must demonstrate some level of past performance and the future capacity to perform under the modified terms. Generally, six months of consecutive payment performance under the restructured terms is required before a TDR is returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower's current creditworthiness is used to assess the borrower's capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected future cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. For TDR s to be removed from TDR status in the calendar year after the restructuring, the loans must (i) have an interest rate and terms that reflect market conditions at the time of restructuring, and (ii) be in compliance with the modified terms. If the loan was restructured at below market rates and terms, it continues to be separately reported as restructured until it is paid in full or charged-off.
Impaired Loans	Impaired Loans – Impaired loans consist of corporate non-accrual loans and TDR s. A loan is considered impaired when it is probable that the Company will not collect all contractual principal and interest. With the exception of accruing TDR s, impaired loans are classified as non-accrual and are exclusive of smaller homogeneous loans, such as home equity, 1-4 family mortgages, and installment loans. Impaired loans with balances under a specified threshold are not individually evaluated for impairment. For all other impaired loans, impairment is measured by comparing the estimated value of the loan to the recorded book value. The value of collateral-dependent loans is based on the fair value of the underlying collateral, less costs to sell. The value of other loans is measured using the present value of expected future cash flows discounted at the loan's initial effective interest rate.
Allowance for Credit/Loan Losses and Reserve for Unfunded Commitments	Allowance for Credit Losses – The allowance for credit losses is comprised of the allowance for loan losses and the reserve for unfunded commitments, and is maintained by management at a level believed adequate to absorb estimated losses inherent in the existing loan portfolio. Determination of the allowance for credit losses is subjective since it requires significant estimates and management judgment, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans, consideration of current economic trends, and other factors. Loans deemed to be uncollectible are charged-off against the allowance for loan losses, while recoveries of amounts previously charged-off are credited to the allowance for loan losses. Additions to the allowance for loan losses are charged to expense through the provision for loan losses. The amount of provision depends on a number of factors, including net charge-off levels, loan growth, changes in the composition of the loan portfolio, and the Company 's assessment of the allowance for loan losses based on the methodology discussed below. Allowance for Loan Losses – The allowance for loan losses consists of (i) specific reserves for individual loans where the recorded investment exceeds the value, (ii) an allowance based on a loss migration analysis that uses historical credit loss experience for each loan category, and (iii) an allowance based on other internal and external qualitative factors. The specific reserves component of the allowance for loan losses is based on a periodic analysis of impaired loans exceeding a fixed dollar amount. If the value of an impaired loan is less than the recorded book value, the Company either establishes a valuation allowance (i.e., a specific reserve) equal to the excess of the book value over the collateral value of the loan as a component of the allowance for loan losses or charges off the amount if it is a confirmed loss. The general reserve component is based on a loss migration analysis, which examines actual loss experience by loan category for a rolling eight quarter period and the related internal risk rating for corporate loans. The loss migration analysis is updated quarterly, primarily using actual loss experience. This component is then adjusted based on management's consideration of many internal and external qualitative factors, including: • Changes in the composition of the loan portfolio, trends in the volume of loans, and trends in delinquent and non-accrual loans that could indicate that historical trends do not reflect current conditions. • Changes in credit policies and procedures, such as underwriting standards and collection, charge-off, and recovery practices. • Changes in the experience, ability, and depth of credit management and other relevant staff. • Changes in the quality of the Company 's loan review system and Board of Directors oversight. • The effect of any concentration of credit and changes in the level of concentrations, such as loan type or risk rating. • Changes in the value of the underlying collateral for collateral-dependent loans. • Changes in the national and local economy that affect the collectability of various segments of the portfolio. • The effect of other external factors, such as competition and legal and regulatory requirements, on the Company 's loan portfolio. The allowance for loan losses also consists of an allowance on acquired and covered non-PCI and PCI loans. No allowance for loan losses is recorded on acquired loans at the acquisition date. Subsequent to the acquisition date, an allowance for credit losses is established as necessary to reflect credit deterioration. The acquired non-PCI allowance is based on management's evaluation of the acquired non-PCI loan portfolio giving consideration to the current portfolio balance, including the remaining acquisition adjustments, maturity dates, and overall credit quality. The allowance for covered non-PCI loans is calculated in the same manner as the general reserve component based on a loss migration analysis as discussed above. The acquired and covered PCI allowance reflects the difference between the carrying value and the discounted expected future cash flows of the acquired and covered PCI loans. On a periodic basis, the adequacy of this allowance is determined through a re-estimation of expected future cash flows on all of the outstanding acquired and covered PCI loans using either a probability of default/loss given default (" PD/LGD ") methodology or a specific review methodology. The PD/LGD model is a loss model that estimates expected future cash flows using a probability of default curve and loss given default estimates. Acquired non-PCI loans that have renewed subsequent to the respective acquisition dates are no longer classified as acquired loans. Instead, they are included in the general loan population and allocated an allowance based on a loss migration analysis. Reserve for Unfunded Commitments – The Company also maintains a reserve for unfunded commitments, including letters of credit, for the risk of loss inherent in these arrangements. The reserve for unfunded commitments is estimated using the loss migration analysis from the allowance for loan losses, adjusted for probabilities of future funding requirements. The reserve for unfunded commitments is included in other liabilities in the Consolidated Statements of Financial Condition. The establishment of the allowance for credit losses involves a high degree of judgment given the difficulty of assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the adequacy of the allowance for credit losses depends on a variety of factors beyond the Company 's control, including the performance of its loan portfolio, the economy, changes in interest rates and property values, and the interpretation of loan risk classifications by regulatory authorities.
Lease Obligations	Lease Obligations – The Company leases certain premises under non-cancelable operating leases in the normal course of business operations. These lease obligations result in the recognition of right-of-use assets and associated lease liabilities. The amount of right-of-use assets and associated lease liabilities recorded is based on the present value of future minimum lease payments. Right-of-use assets are amortized on a straight-line basis over the estimated useful lives of the related premises, and interest associated with the net present value of future minimum lease payments is included in net occupancy and equipment expense in the consolidated financial statements.
Derivative Financial Instruments	Derivative Financial Instruments – To provide derivative products to customers and in the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy to minimize significant unplanned fluctuations in earnings and expected future cash flows caused by interest rate volatility. All derivative instruments are recorded at fair value as either other assets or other liabilities in the Consolidated Statements of Financial Condition. Subsequent changes in a derivative's fair value are recognized in earnings unless specific hedge accounting criteria are met. On the date the Company enters into a derivative contract, the derivative is designated as a fair value hedge, a cash flow hedge, or a non-hedge derivative instrument. Fair value hedges are designed to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk. Cash flow hedges are designed to mitigate exposure to variability in expected future cash flows to be received or paid related to an asset, liability, or other type of forecasted transaction. The Company formally documents all relationships between hedging instruments and hedged items, including its risk management objective and strategy at inception. At the hedge's inception, a formal assessment is performed to determine the effectiveness of the derivative in offsetting changes in the fair values or expected future cash flows of the hedged items in the current period and prospectively. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued prospectively, and the gain or loss is amortized into earnings. For fair value hedges, the gain or loss is amortized over the remaining life of the hedged asset or liability. For cash flow hedges, the gain or loss is amortized over the same period that the forecasted hedged transactions impact earnings. If the hedged item is disposed of, any fair value adjustments are included in the gain or loss from the disposition of the hedged item. If the forecasted transaction is no longer probable, the gain or loss is included in earnings immediately. For fair value hedges, changes in the fair value of the derivative instruments, as well as changes in the fair value of the hedged item, are recognized in earnings in the same income statement line item as the earnings effect of the hedged item. For cash flow hedges, the effective portion of the change in fair value of the derivative instrument is reported as a component of accumulated other comprehensive loss and is reclassified to earnings when the hedged transaction is reflected in earnings.
Recent Accounting Pronouncements	Adopted Accounting Pronouncements Leases: In February of 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02 to increase transparency and comparability across entities for leasing arrangements. This guidance requires lessees to recognize assets and liabilities for most leases. For lessors, this guidance modifies the lease classification criteria and the accounting for sales-type and direct financing leases. In addition, this guidance clarifies criteria for the determination of whether a contract is or contains a lease. This guidance is effective for annual and interim periods beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019, which resulted in the recognition of $143.6 million of right-of-use assets and additional associated lease liabilities for its operating leases. The amount of right-of-use assets and associated lease liabilities recorded upon adoption was based on the present value of future minimum lease payments, the amount of which depended on the population of leases in effect at the date of adoption. This guidance also applies to the Company's net investment in direct financing leases, which is included in loans, but did not have a material impact. The Company has elected certain practical expedients contained in this guidance, which, among other provisions, allowed the Company to not reassess the historical lease classification, initial direct costs, or existing contracts for the inclusion of leases. The Company has also elected the practical expedients for the use of hindsight in determining the lease term and the right-of-use assets, as well as an election not to apply the recognition requirements of the guidance to leases with terms of 12 months or less. The application of the hindsight practical expedient resulted in the determination that most renewal options would not be reasonably certain in determining the expected lease term. First Midwest Bank (the "Bank") entered into a sale-leaseback transaction in 2016 that resulted in a deferred gain. Upon adoption of this guidance, the remaining deferred gain of $47.3 million after-tax was recognized immediately as a cumulative-effect adjustment to equity. For additional discussion of the sale-leaseback transaction, see Note 8 , " Lease Obligations ." The adoption of this guidance was applied retrospectively at the beginning of the period of adoption through a cumulative-effect adjustment and did not materially impact the Company 's results of operations or liquidity but did result in a material increase in assets, liabilities, and equity. Premium Amortization on Purchased Callable Debt Securities: In March of 2017, the FASB issued ASU 2017-08 that shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Improvements to Nonemployee Share-based Payment Accounting: In June of 2018, the FASB issued ASU 2018-07 that aligns the measurement and classification guidance for share-based payments to nonemployees with the guidance for share-based payments to employees. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract: In August of 2018, the FASB issued ASU 2018-15 to reduce diversity in practice by clarifying when implementation costs are required to be capitalized in a cloud computing arrangement that is a service contract. This guidance is effective for annual and interim periods beginning after December 15, 2019. The early adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Derivatives and Hedging, Inclusion of the Secured Overnight Financing Rate ("SOFR") Overnight Index Swap Rate as a Benchmark Interest Rate for Hedge Accounting Purposes: In October of 2018, the FASB issued ASU 2018-16 adding the overnight index swap rate based on the SOFR to the list of United States benchmark interest rates eligible for hedge accounting purposes. This guidance is effective for annual and interim periods beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not materially impact the Company's financial condition, results of operations, or liquidity. Accounting Pronouncements Pending Adoption Measurement of Credit Losses on Financial Instruments: In June of 2016, the FASB issued ASU 2016-13 that will require entities to present financial assets measured at amortized cost at the net amount expected to be collected, considering an entity's current estimate of all expected credit losses. In addition, credit losses relating to available-for-sale debt securities will be required to be recorded through an allowance for credit losses, with changes in credit loss estimates recognized through current earnings. This guidance is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted, but not for periods beginning before December 15, 2018. The Company will adopt this guidance on January 1, 2020. Management is continuing its implementation efforts, which are led by a cross-functional working group. Management is in the process of determining the impact on the Company's financial condition, results of operations, liquidity, and regulatory capital ratios, but expects that the adoption of this guidance will result in an increase in the allowance for credit losses. The extent of the increase will depend on the composition of the loan portfolio, as well as the economic conditions and forecasts as of the adoption date. Accounting for Goodwill Impairment: In January of 2017, the FASB issued ASU 2017-04 that simplifies the accounting for goodwill impairment for all entities. The new guidance eliminates the requirement to calculate the implied fair value of goodwill using the second step of the quantitative two-step goodwill impairment model prescribed under current accounting guidance. Under the new guidance, if a reporting unit's carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. This guidance is effective for annual and interim goodwill impairment testing dates beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity. Changes to the Disclosure Requirements for Fair Value Measurement: In August of 2018, the FASB issued ASU 2018-13 that eliminates, modifies, and adds to certain fair value measurement disclosure requirements associated with the three-tiered fair value hierarchy. This guidance is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity. Changes to the Disclosure Requirements for Defined Benefit Plans: In August of 2018, the FASB issued ASU 2018-14 that makes minor changes and clarifications to the disclosure requirements for entities that sponsor defined benefit plans. This guidance is effective for annual and interim periods beginning after December 15, 2020. Early adoption is permitted. Management does not expect the adoption of this guidance will materially impact the Company's financial condition, results of operations, or liquidity.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Schedule of Acquisition Activity	The following table presents the assets acquired and liabilities assumed, net of the fair value adjustments, in the Bridgeview and Northern States transactions as of the acquisition date. The assets acquired and liabilities assumed, both intangible and tangible, were recorded at their estimated fair values as of the acquisition date and have been accounted for under the acquisition method of accounting. Acquisition Activity (Dollar amounts in thousands, except share and per share data) Bridgeview Northern States May 9, 2019 October 12, 2018 Assets Cash and due from banks and interest-bearing deposits in other banks $ 35,097 $ 160,145 Equity securities 6,966 3,915 Securities available-for-sale 263,090 47,149 Securities held-to-maturity 13,426 — FHLB and FRB stock 1,481 554 Loans 711,688 284,940 OREO 6,160 2,549 Investment in BOLI — 11,104 Goodwill 57,651 30,016 Other intangible assets 15,603 12,230 Premises, furniture, and equipment 18,095 5,820 Accrued interest receivable and other assets 32,534 20,911 Total assets $ 1,161,791 $ 579,333 Liabilities Noninterest-bearing deposits $ 179,267 $ 346,714 Interest-bearing deposits 807,487 116,446 Total deposits 986,754 463,160 Borrowed funds 1,746 18,218 Senior and subordinated debt 29,360 8,038 Accrued interest payable and other liabilities 8,579 6,614 Total liabilities 1,026,439 496,030 Consideration Paid Common stock (2019 – 4,728,541, shares issued at $28.61 per share, 2018 – 3,310,912, shares issued at $25.16 per share), net of issuance costs 98,212 83,303 Cash paid 37,140 — Total consideration paid 135,352 83,303 $ 1,161,791 $ 579,333

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Securities Available-for-Sale	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ 40,946 $ 143 $ (4 ) $ 41,085 $ 37,925 $ 17 $ (175 ) $ 37,767 U.S. agency securities 243,863 1,251 (1,027 ) 244,087 144,125 45 (1,607 ) 142,563 Collateralized mortgage obligations ("CMOs") 1,567,116 25,483 (2,046 ) 1,590,553 1,336,531 3,362 (24,684 ) 1,315,209 Other mortgage-backed securities ("MBSs") 668,935 9,753 (1,181 ) 677,507 477,665 520 (11,251 ) 466,934 Municipal securities 231,757 5,722 (45 ) 237,434 229,600 461 (2,874 ) 227,187 Corporate debt securities 114,407 1,389 (724 ) 115,072 86,074 — (3,725 ) 82,349 Total securities available-for-sale $ 2,867,024 $ 43,741 $ (5,027 ) $ 2,905,738 $ 2,311,920 $ 4,405 $ (44,316 ) $ 2,272,009 Securities Held-to-Maturity Municipal securities $ 22,566 $ — $ (584 ) $ 21,982 $ 10,176 $ — $ (305 ) $ 9,871 Equity Securities $ 40,723 $ 30,806
Securities Held-to-Maturity	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ 40,946 $ 143 $ (4 ) $ 41,085 $ 37,925 $ 17 $ (175 ) $ 37,767 U.S. agency securities 243,863 1,251 (1,027 ) 244,087 144,125 45 (1,607 ) 142,563 Collateralized mortgage obligations ("CMOs") 1,567,116 25,483 (2,046 ) 1,590,553 1,336,531 3,362 (24,684 ) 1,315,209 Other mortgage-backed securities ("MBSs") 668,935 9,753 (1,181 ) 677,507 477,665 520 (11,251 ) 466,934 Municipal securities 231,757 5,722 (45 ) 237,434 229,600 461 (2,874 ) 227,187 Corporate debt securities 114,407 1,389 (724 ) 115,072 86,074 — (3,725 ) 82,349 Total securities available-for-sale $ 2,867,024 $ 43,741 $ (5,027 ) $ 2,905,738 $ 2,311,920 $ 4,405 $ (44,316 ) $ 2,272,009 Securities Held-to-Maturity Municipal securities $ 22,566 $ — $ (584 ) $ 21,982 $ 10,176 $ — $ (305 ) $ 9,871 Equity Securities $ 40,723 $ 30,806
Equity Securities	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Amortized Cost Gross Unrealized Fair Value Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ 40,946 $ 143 $ (4 ) $ 41,085 $ 37,925 $ 17 $ (175 ) $ 37,767 U.S. agency securities 243,863 1,251 (1,027 ) 244,087 144,125 45 (1,607 ) 142,563 Collateralized mortgage obligations ("CMOs") 1,567,116 25,483 (2,046 ) 1,590,553 1,336,531 3,362 (24,684 ) 1,315,209 Other mortgage-backed securities ("MBSs") 668,935 9,753 (1,181 ) 677,507 477,665 520 (11,251 ) 466,934 Municipal securities 231,757 5,722 (45 ) 237,434 229,600 461 (2,874 ) 227,187 Corporate debt securities 114,407 1,389 (724 ) 115,072 86,074 — (3,725 ) 82,349 Total securities available-for-sale $ 2,867,024 $ 43,741 $ (5,027 ) $ 2,905,738 $ 2,311,920 $ 4,405 $ (44,316 ) $ 2,272,009 Securities Held-to-Maturity Municipal securities $ 22,566 $ — $ (584 ) $ 21,982 $ 10,176 $ — $ (305 ) $ 9,871 Equity Securities $ 40,723 $ 30,806
Remaining Contractual Maturity of Securities	Remaining Contractual Maturity of Securities (Dollar amounts in thousands) As of September 30, 2019 Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value One year or less $ 178,227 $ 180,121 $ 9,002 $ 8,769 After one year to five years 175,643 177,509 6,158 5,999 After five years to ten years 277,094 280,039 4,456 4,341 After ten years 9 9 2,950 2,873 Securities that do not have a single contractual maturity date 2,236,051 2,268,060 — — Total $ 2,867,024 $ 2,905,738 $ 22,566 $ 21,982
Securities in an Unrealized Loss Position	The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of September 30, 2019 and December 31, 2018 . Securities in an Unrealized Loss Position (Dollar amounts in thousands) Less Than 12 Months 12 Months or Longer Total Number of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses As of September 30, 2019 Securities Available-for-Sale U.S. treasury securities 5 $ 1,981 $ 1 $ 7,003 $ 3 $ 8,984 $ 4 U.S. agency securities 46 62,206 447 60,746 580 122,952 1,027 CMOs 105 60,802 454 288,184 1,592 348,986 2,046 MBSs 54 10,104 38 167,952 1,143 178,056 1,181 Municipal securities 35 1,194 8 13,975 37 15,169 45 Corporate debt securities 8 9,893 107 29,472 617 39,365 724 Total 253 $ 146,180 $ 1,055 $ 567,332 $ 3,972 $ 713,512 $ 5,027 Securities Held-to-Maturity Municipal securities 31 $ 12,467 $ 331 $ 9,515 $ 253 $ 21,982 $ 584 As of December 31, 2018 Securities Available-for-Sale U.S. treasury securities 17 $ 15,894 $ 57 $ 13,886 $ 118 $ 29,780 $ 175 U.S. agency securities 74 34,263 320 93,227 1,287 127,490 1,607 CMOs 234 171,901 1,671 863,747 23,013 1,035,648 24,684 MBSs 118 135,791 1,715 284,273 9,536 420,064 11,251 Municipal securities 423 60,863 558 109,935 2,316 170,798 2,874 Corporate debt securities 16 82,349 3,725 — — 82,349 3,725 Total 882 $ 501,061 $ 8,046 $ 1,365,068 $ 36,270 $ 1,866,129 $ 44,316 Securities Held-to-Maturity Municipal securities 5 $ — $ — $ 9,871 $ 305 $ 9,871 $ 305

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Composition Of Loan Portfolio	The following table presents the Company 's loans held-for-investment by class. Loan Portfolio (Dollar amounts in thousands) As of September 30, December 31, Commercial and industrial $ 4,570,361 $ 4,120,293 Agricultural 417,740 430,928 Commercial real estate: Office, retail, and industrial 1,892,877 1,820,917 Multi-family 817,444 764,185 Construction 637,256 649,337 Other commercial real estate 1,425,292 1,361,810 Total commercial real estate 4,772,869 4,596,249 Total corporate loans 9,760,970 9,147,470 Home equity 833,955 851,607 1-4 family mortgages 1,686,967 1,017,181 Installment 491,427 430,525 Total consumer loans 3,012,349 2,299,313 Total loans $ 12,773,319 $ 11,446,783 Deferred loan fees included in total loans $ 7,233 $ 6,715 Overdrawn demand deposits included in total loans 10,440 8,583
Schedule Of Loans Sold	The following table presents loan sales for the quarters and nine months ended September 30, 2019 and 2018 . Loan Sales (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Corporate loan sales Proceeds from sales $ 5,108 $ 2,868 $ 10,484 $ 15,180 Less book value of loans sold 4,950 2,827 10,198 14,811 Net gains on corporate loan sales (1) 158 41 286 369 1-4 family mortgage loan sales Proceeds from sales $ 143,776 $ 62,576 $ 297,967 $ 193,476 Less book value of loans sold 140,998 61,276 291,926 189,370 Net gains on 1-4 family mortgage loan sales (2) 2,778 1,300 6,041 4,106 Total net gains on loan sales $ 2,936 $ 1,341 $ 6,327 $ 4,475 (1) Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income. (2) Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income.

Acquired and Covered Loans (Tab

Acquired and Covered Loans (Tables)	9 Months Ended
	Sep. 30, 2019
Transfers and Servicing [Abstract]
Schedule of Acquired Loans	The following table presents the carrying amount of acquired and covered PCI and non-PCI loans as of September 30, 2019 and December 31, 2018 . Acquired and Covered Loans (1) (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 PCI Non-PCI Total PCI Non-PCI Total Acquired loans $ 160,360 $ 1,404,960 $ 1,565,320 $ 108,049 $ 1,247,492 $ 1,355,541 Covered loans 5,466 4,017 9,483 5,819 4,869 10,688 Total acquired and covered loans $ 165,826 $ 1,408,977 $ 1,574,803 $ 113,868 $ 1,252,361 $ 1,366,229 (1) Included in loans in the Consolidated Statements of Financial Condition.
Schedule Of Changes In Accretable Yield For Purchased Credit Impaired Loans	Changes in the accretable yield for acquired and covered PCI loans were as follows. Changes in Accretable Yield (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Beginning balances $ 50,885 $ 39,008 $ 43,725 $ 32,957 Additions — — 16,037 — Accretion (5,759 ) (3,008 ) (13,630 ) (9,548 ) Other (1) (613 ) 2,672 (1,619 ) 15,263 Ending balance $ 44,513 $ 38,672 $ 44,513 $ 38,672 (1) Increases represent a rise in the expected future cash flows to be collected over the remaining estimated life of the underlying portfolio, while decreases result from the resolution of certain loans occurring earlier than anticipated.

Past Due Loans, Allowance For_2

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS (Tables)	9 Months Ended
	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Past Due Financing Receivables	The following table presents an aging analysis of the Company 's past due loans as of September 30, 2019 and December 31, 2018 . The aging is determined without regard to accrual status. The table also presents non-performing loans, consisting of non-accrual loans (the majority of which are past due) and loans 90 days or more past due and still accruing interest, as of each balance sheet date. Aging Analysis of Past Due Loans and Non-performing Loans by Class (Dollar amounts in thousands) Aging Analysis (Accruing and Non-accrual) Non-performing Loans Current (1) 30-89 Days Past Due 90 Days or More Past Due Total Past Due Total Loans Non- accrual 90 Days or More Past Due, Still Accruing Interest As of September 30, 2019 Commercial and industrial $ 4,537,236 $ 20,929 $ 12,196 $ 33,125 $ 4,570,361 $ 26,739 $ 1,982 Agricultural 404,731 6,966 6,043 13,009 417,740 6,242 23 Commercial real estate: Office, retail, and industrial 1,869,816 7,289 15,772 23,061 1,892,877 26,812 — Multi-family 813,422 1,870 2,152 4,022 817,444 2,152 — Construction 635,270 1,771 215 1,986 637,256 152 63 Other commercial real estate 1,419,276 1,851 4,165 6,016 1,425,292 4,680 1,112 Total commercial real estate 4,737,784 12,781 22,304 35,085 4,772,869 33,796 1,175 Total corporate loans 9,679,751 40,676 40,543 81,219 9,760,970 66,777 3,180 Home equity 823,373 6,373 4,209 10,582 833,955 7,326 175 1-4 family mortgages 1,680,096 5,292 1,579 6,871 1,686,967 3,589 — Installment 488,592 1,533 1,302 2,835 491,427 — 1,302 Total consumer loans 2,992,061 13,198 7,090 20,288 3,012,349 10,915 1,477 Total loans $ 12,671,812 $ 53,874 $ 47,633 $ 101,507 $ 12,773,319 $ 77,692 $ 4,657 As of December 31, 2018 Commercial and industrial $ 4,085,164 $ 8,832 $ 26,297 $ 35,129 $ 4,120,293 $ 33,507 $ 422 Agricultural 428,357 940 1,631 2,571 430,928 1,564 101 Commercial real estate: Office, retail, and industrial 1,803,059 8,209 9,649 17,858 1,820,917 6,510 4,081 Multi-family 759,402 1,487 3,296 4,783 764,185 3,107 189 Construction 645,774 3,419 144 3,563 649,337 144 — Other commercial real estate 1,353,442 4,921 3,447 8,368 1,361,810 2,854 2,197 Total commercial real estate 4,561,677 18,036 16,536 34,572 4,596,249 12,615 6,467 Total corporate loans 9,075,198 27,808 44,464 72,272 9,147,470 47,686 6,990 Home equity 843,217 6,285 2,105 8,390 851,607 5,393 104 1-4 family mortgages 1,009,925 4,361 2,895 7,256 1,017,181 3,856 1,147 Installment 428,836 1,648 41 1,689 430,525 — 41 Total consumer loans 2,281,978 12,294 5,041 17,335 2,299,313 9,249 1,292 Total loans $ 11,357,176 $ 40,102 $ 49,505 $ 89,607 $ 11,446,783 $ 56,935 $ 8,282 (1) PCI loans with an accretable yield are considered current.
Allowance for Credit Losses on Financing Receivables	A rollforward of the allowance for credit losses by portfolio segment for the quarters and nine months ended September 30, 2019 and 2018 is presented in the table below. Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Commercial, Industrial, and Agricultural Office, Retail, and Industrial Multi- family Construction Other Commercial Real Estate Consumer Reserve for Unfunded Commitments Total Allowance for Credit Losses Quarter Ended September 30, 2019 Beginning balance $ 66,364 $ 7,495 $ 2,159 $ 1,862 $ 4,997 $ 22,852 $ 1,200 $ 106,929 Charge-offs (7,176 ) (293 ) — — (184 ) (3,619 ) — (11,272 ) Recoveries 1,205 74 38 2 227 527 — 2,073 Net charge-offs (5,971 ) (219 ) 38 2 43 (3,092 ) — (9,199 ) Provision for loan losses and other 5,002 65 565 (98 ) 1,188 5,776 — 12,498 Ending balance $ 65,395 $ 7,341 $ 2,762 $ 1,766 $ 6,228 $ 25,536 $ 1,200 $ 110,228 Quarter Ended September 30, 2018 Beginning balance $ 60,043 $ 9,062 $ 2,175 $ 2,124 $ 4,631 $ 18,656 $ 1,000 $ 97,691 Charge-offs (6,277 ) (759 ) (1 ) (1 ) (177 ) (2,049 ) — (9,264 ) Recoveries 416 163 — 5 154 512 — 1,250 Net charge-offs (5,861 ) (596 ) (1 ) 4 (23 ) (1,537 ) — (8,014 ) Provision for loan losses and other 6,776 15 200 116 740 3,401 — 11,248 Ending balance $ 60,958 $ 8,481 $ 2,374 $ 2,244 $ 5,348 $ 20,520 $ 1,000 $ 100,925 Nine Months Ended September 30, 2019 Beginning balance $ 63,276 $ 7,900 $ 2,464 $ 2,173 $ 4,934 $ 21,472 $ 1,200 $ 103,419 Charge-offs (20,143 ) (2,526 ) (340 ) (6 ) (723 ) (9,735 ) — (33,473 ) Recoveries 3,764 235 39 18 293 1,500 — 5,849 Net charge-offs (16,379 ) (2,291 ) (301 ) 12 (430 ) (8,235 ) — (27,624 ) Provision for loan losses and other 18,498 1,732 599 (419 ) 1,724 12,299 — 34,433 Ending balance $ 65,395 $ 7,341 $ 2,762 $ 1,766 $ 6,228 $ 25,536 $ 1,200 $ 110,228 Nine Months Ended September 30, 2018 Beginning balance $ 55,791 $ 10,996 $ 2,534 $ 3,481 $ 6,381 $ 16,546 $ 1,000 $ 96,729 Charge-offs (29,609 ) (1,525 ) (5 ) (1 ) (247 ) (6,271 ) — (37,658 ) Recoveries 1,707 286 — 26 552 1,240 — 3,811 Net charge-offs (27,902 ) (1,239 ) (5 ) 25 305 (5,031 ) — (33,847 ) Provision for loan losses and other 33,069 (1,276 ) (155 ) (1,262 ) (1,338 ) 9,005 — 38,043 Ending balance $ 60,958 $ 8,481 $ 2,374 $ 2,244 $ 5,348 $ 20,520 $ 1,000 $ 100,925
Schedule of Loans and The Related Allowance For Credit Losses	The table below provides a breakdown of loans and the related allowance for credit losses by portfolio segment as of September 30, 2019 and December 31, 2018 . Loans and Related Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Loans Allowance for Credit Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment PCI Total Individually Evaluated for Impairment Collectively Evaluated for Impairment PCI Total As of September 30, 2019 Commercial, industrial, and agricultural $ 31,169 $ 4,907,442 $ 49,490 $ 4,988,101 $ 2,556 $ 62,465 $ 374 $ 65,395 Commercial real estate: Office, retail, and industrial 26,255 1,841,712 24,910 1,892,877 522 6,696 123 7,341 Multi-family 1,995 809,711 5,738 817,444 — 2,666 96 2,762 Construction 123 623,689 13,444 637,256 — 1,765 1 1,766 Other commercial real estate 3,657 1,372,354 49,281 1,425,292 95 4,579 1,554 6,228 Total commercial real estate 32,030 4,647,466 93,373 4,772,869 617 15,706 1,774 18,097 Total corporate loans 63,199 9,554,908 142,863 9,760,970 3,173 78,171 2,148 83,492 Consumer — 2,989,386 22,963 3,012,349 — 24,460 1,076 25,536 Reserve for unfunded commitments — — — — — 1,200 — 1,200 Total loans $ 63,199 $ 12,544,294 $ 165,826 $ 12,773,319 $ 3,173 $ 103,831 $ 3,224 $ 110,228 As of December 31, 2018 Commercial, industrial, and agricultural $ 32,415 $ 4,514,349 $ 4,457 $ 4,551,221 $ 3,961 $ 58,947 $ 368 $ 63,276 Commercial real estate: Office, retail, and industrial 5,057 1,799,304 16,556 1,820,917 748 5,984 1,168 7,900 Multi-family 3,492 747,030 13,663 764,185 — 2,154 310 2,464 Construction — 644,499 4,838 649,337 — 2,019 154 2,173 Other commercial real estate 1,545 1,305,444 54,821 1,361,810 — 4,180 754 4,934 Total commercial real estate 10,094 4,496,277 89,878 4,596,249 748 14,337 2,386 17,471 Total corporate loans 42,509 9,010,626 94,335 9,147,470 4,709 73,284 2,754 80,747 Consumer — 2,279,780 19,533 2,299,313 — 20,094 1,378 21,472 Reserve for unfunded commitments — — — — — 1,200 — 1,200 Total loans $ 42,509 $ 11,290,406 $ 113,868 $ 11,446,783 $ 4,709 $ 94,578 $ 4,132 $ 103,419
Impaired Financing Receivables	The following table presents the average recorded investment and interest income recognized on impaired loans by class for the quarters and nine months ended September 30, 2019 and 2018 . PCI loans are excluded from this disclosure. Average Recorded Investment and Interest Income Recognized on Impaired Loans by Class (Dollar amounts in thousands) Quarters Ended September 30, 2019 2018 Average Interest Income Recognized (1) Average Interest Income Recognized (1) Commercial and industrial $ 21,111 $ 74 $ 28,082 $ 123 Agricultural 6,249 9 2,372 — Commercial real estate: Office, retail, and industrial 20,773 2 6,641 105 Multi-family 3,578 48 3,757 11 Construction 123 — — — Other commercial real estate 3,496 42 2,831 68 Total commercial real estate 27,970 92 13,229 184 Total impaired loans $ 55,330 $ 175 $ 43,683 $ 307 Nine Months Ended September 30, 2019 2018 Average Interest (1) Average Interest (1) Commercial and industrial $ 26,275 $ 100 $ 34,440 $ 159 Agricultural 4,032 20 2,153 25 Commercial real estate: Office, retail, and industrial 15,611 6 8,867 873 Multi-family 3,456 48 2,132 66 Construction 62 — — — Other commercial real estate 2,517 84 2,338 181 Total commercial real estate 21,646 138 13,337 1,120 Total impaired loans $ 51,953 $ 258 $ 49,930 $ 1,304 (1) Recorded using the cash basis of accounting. The following table presents loans individually evaluated for impairment by class of loan as of September 30, 2019 and December 31, 2018 . PCI loans are excluded from this disclosure. Impaired Loans Individually Evaluated by Class (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Recorded Investment In Recorded Investment In Loans with No Specific Reserve Loans with a Specific Reserve Unpaid Principal Balance Specific Reserve Loans with No Specific Reserve Loans with a Specific Reserve Unpaid Principal Balance Specific Reserve Commercial and industrial $ 10,600 $ 14,540 $ 50,231 $ 1,636 $ 7,550 $ 23,349 $ 49,102 $ 3,960 Agricultural 1,905 4,124 9,566 920 1,318 198 3,997 1 Commercial real estate: Office, retail, and industrial 16,440 9,815 38,296 522 1,861 3,196 6,141 748 Multi-family 1,995 — 1,995 — 3,492 — 3,492 — Construction 123 — 123 — — — — — Other commercial real estate 2,562 1,095 4,008 95 1,545 — 1,612 — Total commercial real estate 21,120 10,910 44,422 617 6,898 3,196 11,245 748 Total impaired loans individually evaluated for impairment $ 33,625 $ 29,574 $ 104,219 $ 3,173 $ 15,766 $ 26,743 $ 64,344 $ 4,709
Financing Receivable Credit Quality Indicators	Consumer Credit Quality Indicators by Class (Dollar amounts in thousands) Performing Non-accrual Total As of September 30, 2019 Home equity $ 826,629 $ 7,326 $ 833,955 1-4 family mortgages 1,683,378 3,589 1,686,967 Installment 491,427 — 491,427 Total consumer loans $ 3,001,434 $ 10,915 $ 3,012,349 As of December 31, 2018 Home equity $ 846,214 $ 5,393 $ 851,607 1-4 family mortgages 1,013,325 3,856 1,017,181 Installment 430,525 — 430,525 Total consumer loans $ 2,290,064 $ 9,249 $ 2,299,313 September 30, 2019 and December 31, 2018 . Corporate Credit Quality Indicators by Class (Dollar amounts in thousands) Pass Special Mention (1)(4) Substandard (2)(4) Non-accrual (3) Total As of September 30, 2019 Commercial and industrial $ 4,404,464 $ 63,434 $ 75,724 $ 26,739 $ 4,570,361 Agricultural 373,757 22,495 15,246 6,242 417,740 Commercial real estate: Office, retail, and industrial 1,793,811 41,332 30,922 26,812 1,892,877 Multi-family 799,218 10,068 6,006 2,152 817,444 Construction 612,810 14,147 10,147 152 637,256 Other commercial real estate 1,352,801 33,893 33,918 4,680 1,425,292 Total commercial real estate 4,558,640 99,440 80,993 33,796 4,772,869 Total corporate loans $ 9,336,861 $ 185,369 $ 171,963 $ 66,777 $ 9,760,970 As of December 31, 2018 Commercial and industrial $ 3,952,066 $ 74,878 $ 59,842 $ 33,507 $ 4,120,293 Agricultural 407,542 10,070 11,752 1,564 430,928 Commercial real estate: Office, retail, and industrial 1,735,426 35,853 43,128 6,510 1,820,917 Multi-family 745,131 9,273 6,674 3,107 764,185 Construction 624,446 16,370 8,377 144 649,337 Other commercial real estate 1,294,128 47,736 17,092 2,854 1,361,810 Total commercial real estate 4,399,131 109,232 75,271 12,615 4,596,249 Total corporate loans $ 8,758,739 $ 194,180 $ 146,865 $ 47,686 $ 9,147,470 (1) Loans categorized as special mention exhibit potential weaknesses that require the close attention of management since these potential weaknesses may result in the deterioration of repayment prospects in the future. (2) Loans categorized as substandard exhibit well-defined weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well-secured, and collection of principal and interest is expected within a reasonable time. (3) Loans categorized as non-accrual exhibit well-defined weaknesses that may jeopardize the liquidation of the debt or result in a loss if the deficiencies are not corrected. (4) Total special mention and substandard loans includes accruing TDR s of $232,000 as of September 30, 2019 and $630,000 as of December 31, 2018 .
Troubled Debt Restructuring Activity Rollforward	The table below presents TDR s by class as of September 30, 2019 and December 31, 2018 . See Note 1, "Summary of Significant Accounting Policies," for the accounting policy for TDR s. TDR s by Class (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Accruing Non-accrual (1) Total Accruing Non-accrual (1) Total Commercial and industrial $ 232 $ 4,561 $ 4,793 $ 246 $ 5,994 $ 6,240 Agricultural — — — — — — Commercial real estate: Office, retail, and industrial — — — — — — Multi-family 165 — 165 557 — 557 Construction — — — — — — Other commercial real estate 173 — 173 181 — 181 Total commercial real estate 338 — 338 738 — 738 Total corporate loans 570 4,561 5,131 984 5,994 6,978 Home equity 107 249 356 113 327 440 1-4 family mortgages 745 278 1,023 769 291 1,060 Installment — — — — — — Total consumer loans 852 527 1,379 882 618 1,500 Total loans $ 1,422 $ 5,088 $ 6,510 $ 1,866 $ 6,612 $ 8,478 (1) These TDR s are included in non-accrual loans in the preceding tables. A rollforward of the carrying value of TDR s for the quarters and nine months ended September 30, 2019 and 2018 is presented in the following table. TDR Rollforward (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Accruing Beginning balance $ 1,441 $ 1,760 $ 1,866 $ 1,796 Additions — — 12 — Net payments (19 ) (19 ) (73 ) (55 ) Net transfers to non-accrual — — (383 ) — Ending balance 1,422 1,741 1,422 1,741 Non-accrual Beginning balance 7,841 8,238 6,612 24,533 Additions — — — 355 Net payments (2,753 ) (1,620 ) (1,279 ) (14,598 ) Charge-offs — (253 ) (628 ) (3,925 ) Net transfers from accruing — — 383 — Ending balance 5,088 6,365 5,088 6,365 Total TDRs $ 6,510 $ 8,106 $ 6,510 $ 8,106

Lease Obligations (Tables)

Lease Obligations (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Schedule of Future Minimum Lease Liability	The following summary reflects the future minimum payments by year required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year and a reconciliation of those payments to the Company's lease liability as of September 30, 2019 . Lease Liability (Dollar amounts in thousands) As of Year Ending December 31, 2019 $ 4,059 2020 17,736 2021 17,611 2022 17,618 2023 17,752 2024 and thereafter 115,842 Total minimum lease payments 190,618 Discount (1) (30,783 ) Lease liability (2) $ 159,835 (1) Represents the net present value adjustment related to minimum lease payments. (2) Included in accrued interest payable and other liabilities in the Consolidated Statements of Financial Condition.
Schedule of Net Operating Lease Expense	The following table presents net operating lease expense for the quarters and nine months ended September 30, 2019 and 2018 . Net Operating Lease Expense (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Lease expense charged to operations $ 4,467 $ 4,730 $ 12,953 $ 14,673 Accretion of operating lease intangible (1) — (211 ) — (716 ) Accretion of deferred gain on sale-leaseback transaction (1) — (1,463 ) — (4,389 ) Rental income from premises leased to others (1) (203 ) (122 ) (525 ) (384 ) Net operating lease expense $ 4,264 $ 2,934 $ 12,428 $ 9,184 (1) Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The table below displays the calculation of basic and diluted earnings per common share (" EPS "). Basic and Diluted EPS (Amounts in thousands, except per share data) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Net income $ 54,545 $ 53,352 $ 147,617 $ 116,462 Net income applicable to non-vested restricted shares (465 ) (441 ) (1,257 ) (992 ) Net income applicable to common shares $ 54,080 $ 52,911 $ 146,360 $ 115,470 Weighted-average common shares outstanding: Weighted-average common shares outstanding (basic) 109,281 102,178 107,852 102,087 Dilutive effect of common stock equivalents 381 — 394 5 Weighted-average diluted common shares outstanding 109,662 102,178 108,246 102,092 Basic EPS $ 0.49 $ 0.52 $ 1.36 $ 1.13 Diluted EPS $ 0.49 $ 0.52 $ 1.35 $ 1.13 Anti-dilutive shares not included in the computation of diluted EPS (1) — — — 36 (1) This amount represents outstanding stock options for which the exercise price is greater than the average market price of the Company's common stock. The final outstanding stock options were exercised during the first quarter of 2018.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	Cash Flow Hedges (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Gross notional amount outstanding $ 1,880,000 $ 2,280,000 Derivative asset fair value in other assets (1) 2,059 6,889 Derivative liability fair value in other liabilities (1) (205 ) (11,328 ) Weighted-average interest rate received 2.02 % 2.12 % Weighted-average interest rate paid 1.97 % 2.20 % Weighted-average maturity (in years) 1.41 1.53 (1) Certain cash flow hedges are transacted through a clearinghouse ("centrally cleared") and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. The following table presents the impact of derivative instruments on net interest income for the quarters and nine months ended September 30, 2019 and 2018 . Hedge Income (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Cash Flow Hedges Interest rate swaps in interest income $ 824 $ 857 $ 3,572 $ 1,504 Interest rate swaps in interest expense (1,018 ) (978 ) (4,966 ) (2,087 ) Total cash flow hedges $ (194 ) $ (121 ) $ (1,394 ) $ (583 )
Schedule of Derivative Instruments	Other Derivative Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Gross notional amount outstanding $ 3,738,566 $ 3,085,226 Derivative asset fair value in other assets (1) 80,156 25,168 Derivative liability fair value in other liabilities (1) (25,137 ) (17,533 ) Fair value of derivative (2) 25,346 18,013 (1) Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. (2) This amount represents the fair value if credit risk related contingent features were triggered.
Cash Flow Hedge Accounting on AOCI	The following table presents the impact of derivative instruments on comprehensive income and the reclassification of gains (losses) from accumulated other comprehensive loss to net interest income for the quarters and nine months ended September 30, 2019 and 2018 . Cash Flow Hedge Accounting on AOCI (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Gains (losses) recognized in other comprehensive income Interest rate swaps in interest income $ 2,218 $ 2,578 $ 11,515 $ 13,151 Interest rate swaps in interest expense (1,625 ) (1,577 ) (13,621 ) (11,620 ) Reclassification of gains (losses) included in net income Interest rate swaps in interest income $ 824 $ 857 $ 3,572 $ 1,504 Interest rate swaps in interest expense (1,018 ) (978 ) (4,966 ) (2,087 )
Offsetting Assets	The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2019 and December 31, 2018 . Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Assets Liabilities Assets Liabilities Gross amounts recognized $ 82,215 $ 25,342 $ 32,057 $ 28,861 Less: amounts offset in the Consolidated Statements of Financial Condition — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 82,215 25,342 32,057 28,861 Gross amounts not offset in the Consolidated Statements of Financial Condition: Offsetting derivative positions (3,668 ) (3,668 ) (11,678 ) (11,678 ) Cash collateral pledged — (16,557 ) (9,060 ) (3,506 ) Net credit exposure $ 78,547 $ 5,117 $ 11,319 $ 13,677 (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.
Offsetting Liabilities	The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2019 and December 31, 2018 . Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Assets Liabilities Assets Liabilities Gross amounts recognized $ 82,215 $ 25,342 $ 32,057 $ 28,861 Less: amounts offset in the Consolidated Statements of Financial Condition — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 82,215 25,342 32,057 28,861 Gross amounts not offset in the Consolidated Statements of Financial Condition: Offsetting derivative positions (3,668 ) (3,668 ) (11,678 ) (11,678 ) Cash collateral pledged — (16,557 ) (9,060 ) (3,506 ) Net credit exposure $ 78,547 $ 5,117 $ 11,319 $ 13,677 (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.

Commitments, Guarantees, and _2

Commitments, Guarantees, and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments Disclosure	Contractual or Notional Amounts of Financial Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Commitments to extend credit: Commercial, industrial, and agricultural $ 1,748,889 $ 1,729,286 Commercial real estate 327,821 296,882 Home equity 571,389 570,553 Other commitments (1) 254,689 244,917 Total commitments to extend credit $ 2,902,788 $ 2,841,638 Letters of credit $ 104,286 $ 112,728 (1) Other commitments includes installment and overdraft protection program commitments.

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following table provides the fair value for assets and liabilities required to be measured at fair value on a recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Equity securities $ 22,511 $ 13,174 $ — $ 19,658 $ 11,148 $ — Securities available-for-sale U.S. treasury securities 41,085 — — 37,767 — — U.S. agency securities — 244,087 — — 142,563 — CMOs — 1,590,553 — — 1,315,209 — MBSs — 677,507 — — 466,934 — Municipal securities — 237,434 — — 227,187 — Corporate debt securities — 115,072 — — 82,349 — Total securities available-for-sale 41,085 2,864,653 — 37,767 2,234,242 — Mortgage servicing rights ("MSRs") (1) — — 5,682 — — 6,730 Derivative assets (1) — 82,215 — — 32,057 — Liabilities Derivative liabilities (2) $ — $ 25,342 $ — $ — $ 28,861 $ — (1) Included in other assets in the Consolidated Statements of Financial Condition. (2) Included in other liabilities in the Consolidated Statements of Financial Condition.
Significant Unobservable Inputs Used in the Valuation of MSRs	The following table presents the ranges of significant, unobservable inputs used by the Company to determine the fair value of MSR s as of September 30, 2019 and December 31, 2018 . Significant Unobservable Inputs Used in the Valuation of MSR s As of September 30, 2019 December 31, 2018 Prepayment speed 6.0 % - 10.6% 6.5 % - 13.5% Maturity (months) 17 - 89 20 - 104 Discount rate 9.0 % - 12.0% 9.5 % - 12.0%
Schedule of Servicing Assets at Fair Value	A rollforward of the carrying value of MSR s for the quarters and nine months ended September 30, 2019 and 2018 is presented in the following table. Carrying Value of MSR s (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2019 2018 2019 2018 Beginning balance $ 5,831 $ 6,671 $ 6,730 $ 5,894 New MSRs 404 324 861 893 Total gains (losses) included in earnings (1) : Changes in valuation inputs and assumptions (284 ) 65 (1,273 ) 627 Other changes in fair value (2) (269 ) (243 ) (636 ) (597 ) Ending balance (3) $ 5,682 $ 6,817 $ 5,682 $ 6,817 Contractual servicing fees earned (1) $ 404 $ 375 $ 1,175 $ 1,122 (1) Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2019 and 2018 . (2) Primarily represents changes in expected future cash flows due to payoffs and paydowns. (3) Included in other assets in the Consolidated Statements of Financial Condition.
Fair Value Measurements, Nonrecurring	The following table provides the fair value for each class of assets and liabilities required to be measured at fair value on a non-recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Non-Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2019 As of December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Collateral-dependent impaired loans (1) $ — $ — $ 35,984 $ — $ — $ 24,565 OREO (2) — — 3,461 — — 6,012 Loans held-for-sale (3) — — 47,455 — — 3,478 Assets held-for-sale (4) — — 8,626 — — 3,722 (1) Includes impaired loans with charge-offs and impaired loans with a specific reserve during the periods presented. (2) Includes OREO with fair value adjustments subsequent to initial transfer that occurred during the periods presented. (3) Included in other assets in the Consolidated Statements of Financial Condition. (4) Included in premises, furniture, and equipment in the Consolidated Statements of Financial Condition.
Fair Value, by Balance Sheet Grouping	For certain financial instruments that are not required to be measured at fair value in the Consolidated Statements of Financial Condition, the Company must disclose the estimated fair values and the level within the fair value hierarchy as shown in the following table. Fair Value Measurements of Other Financial Instruments (Dollar amounts in thousands) As of September 30, 2019 December 31, 2018 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Assets Cash and due from banks 1 $ 273,613 $ 273,613 $ 211,189 $ 211,189 Interest-bearing deposits in other banks 2 202,054 202,054 78,069 78,069 Securities held-to-maturity 2 22,566 21,982 10,176 9,871 FHLB and FRB stock 2 112,845 112,845 80,302 80,302 Loans 3 12,665,485 12,561,148 11,346,668 11,052,040 Investment in BOLI 3 297,610 297,610 296,733 296,733 Accrued interest receivable 3 58,223 58,223 54,847 54,847 Liabilities Deposits 2 $ 13,440,927 $ 13,438,885 $ 12,084,112 $ 12,064,604 Borrowed funds 2 1,653,490 1,653,490 906,079 906,079 Senior and subordinated debt 2 233,743 276,715 203,808 211,207 Accrued interest payable 2 12,000 12,000 10,005 10,005

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jan. 01, 2019		Jan. 01, 2018	[3]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset		$ 139,500	$ 143,600
Lease liability	[1]	$ 159,835
Adjustments to apply recent accounting pronouncements			47,257	[2]	$ 0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments to apply recent accounting pronouncements			$ 47,257	[2]	$ 6,689
[1]	Included in accrued interest payable and other liabilities in the Consolidated Statements of Financial Condition.
[2]	As a result of accounting guidance adopted in the first quarter of 2019, the remaining deferred gain on a sale-leaseback transaction was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2019. For further discussion of this guidance, see Note 2 , " Recent Accounting Pronouncements ."
[3]	As a result of accounting guidance adopted in the first quarter of 2018, certain reclassifications were made from accumulated other comprehensive income (loss) to retained earnings as of January 1, 2018.

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 27, 2019	May 09, 2019	Oct. 12, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jan. 16, 2019
Business Acquisition [Line Items]
Acquisition and integration related expenses				$ 3,397	$ 60	$ 16,602	$ 60
Bankmanagers Corporation
Business Acquisition [Line Items]
Announced assets to be acquired								$ 1,000,000
Announced deposits to be acquired								815,000
Announced loans to be acquired								$ 700,000
Fixed exchange ratio (in shares)	29.9675
Cash paid per share (in dollars per share)	$ 623.02
Consideration to be transferred	$ 195,000
Bridgeview Bancorp, Inc.
Business Acquisition [Line Items]
Fixed exchange ratio (in shares)		0.2767
Cash paid per share (in dollars per share)		$ 1.66
Total assets		$ 1,161,791
Total deposits		986,754
Loans		711,688
Consideration transferred		$ 135,352
Common stock, shares issued (in shares)		4,728,541
Cash paid		$ 37,140
Goodwill		$ 57,651
Northern Oak Wealth Management, Inc.
Business Acquisition [Line Items]
Assets under management acquired									$ 800,000
Northern States Financial Corporation
Business Acquisition [Line Items]
Fixed exchange ratio (in shares)			0.0363
Total assets			$ 579,333
Total deposits			463,160
Loans			284,940
Consideration transferred			$ 83,303
Common stock, shares issued (in shares)			3,310,912
Cash paid			$ 0
Goodwill			$ 30,016

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquisition Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	May 09, 2019	Oct. 12, 2018
Bridgeview Bancorp, Inc.
Assets
Cash and due from banks and interest-bearing deposits in other banks	$ 35,097
Equity securities	6,966
Securities available-for-sale	263,090
Securities held-to-maturity	13,426
FHLB and FRB stock	1,481
Loans	711,688
OREO	6,160
Investment in BOLI	0
Goodwill	57,651
Other intangible assets	15,603
Premises, furniture, and equipment	18,095
Accrued interest receivable and other assets	32,534
Total assets	1,161,791
Liabilities
Noninterest-bearing deposits	179,267
Interest-bearing deposits	807,487
Total deposits	986,754
Borrowed funds	1,746
Senior and subordinated debt	29,360
Accrued interest payable and other liabilities	8,579
Total liabilities	1,026,439
Consideration Paid
Common stock (2019 – 4,728,541, shares issued at $28.61 per share, 2018 – 3,310,912, shares issued at $25.16 per share), net of issuance costs	98,212
Cash paid	37,140
Total consideration paid	$ 135,352
Shares issued (in dollars per share)	$ 28.61
Common stock, shares issued (in shares)	4,728,541
Northern States Financial Corporation
Assets
Cash and due from banks and interest-bearing deposits in other banks		$ 160,145
Equity securities		3,915
Securities available-for-sale		47,149
Securities held-to-maturity		0
FHLB and FRB stock		554
Loans		284,940
OREO		2,549
Investment in BOLI		11,104
Goodwill		30,016
Other intangible assets		12,230
Premises, furniture, and equipment		5,820
Accrued interest receivable and other assets		20,911
Total assets		579,333
Liabilities
Noninterest-bearing deposits		346,714
Interest-bearing deposits		116,446
Total deposits		463,160
Borrowed funds		18,218
Senior and subordinated debt		8,038
Accrued interest payable and other liabilities		6,614
Total liabilities		496,030
Consideration Paid
Common stock (2019 – 4,728,541, shares issued at $28.61 per share, 2018 – 3,310,912, shares issued at $25.16 per share), net of issuance costs		83,303
Cash paid		0
Total consideration paid		$ 83,303
Shares issued (in dollars per share)		$ 25.16
Common stock, shares issued (in shares)		3,310,912

Securities - Securities Portfol

Securities - Securities Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Equity securities	$ 40,723	$ 30,806
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,867,024	2,311,920
Gross Unrealized Gains	43,741	4,405
Gross Unrealized Losses	(5,027)	(44,316)
Fair Value	2,905,738	2,272,009
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,566	10,176
Fair Value	21,982
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,946	37,925
Gross Unrealized Gains	143	17
Gross Unrealized Losses	(4)	(175)
Fair Value	41,085	37,767
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	243,863	144,125
Gross Unrealized Gains	1,251	45
Gross Unrealized Losses	(1,027)	(1,607)
Fair Value	244,087	142,563
Collateralized mortgage obligations (CMOs)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,567,116	1,336,531
Gross Unrealized Gains	25,483	3,362
Gross Unrealized Losses	(2,046)	(24,684)
Fair Value	1,590,553	1,315,209
Other mortgage-backed securities (MBSs)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	668,935	477,665
Gross Unrealized Gains	9,753	520
Gross Unrealized Losses	(1,181)	(11,251)
Fair Value	677,507	466,934
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,757	229,600
Gross Unrealized Gains	5,722	461
Gross Unrealized Losses	(45)	(2,874)
Fair Value	237,434	227,187
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,566	10,176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(584)	(305)
Fair Value	21,982	9,871
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,407	86,074
Gross Unrealized Gains	1,389	0
Gross Unrealized Losses	(724)	(3,725)
Fair Value	115,072	82,349
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities	$ 40,723	$ 30,806

Securities - Remaining Contract

Securities - Remaining Contractual Maturity of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale Securities, Amortized Cost [Abstract]
One year or less	$ 178,227
After one year to five years	175,643
After five years to ten years	277,094
After ten years	9
Securities that do not have a single contractual maturity date	2,236,051
Amortized Cost	2,867,024	$ 2,311,920
Fair Value
One year or less	180,121
After one year to five years	177,509
After five years to ten years	280,039
After ten years	9
Securities that do not have a single contractual maturity date	2,268,060
Fair Value	2,905,738	2,272,009
Held-to-maturity Securities, Amortized Cost [Abstract]
One year or less	9,002
After one year to five years	6,158
After five years to ten years	4,456
After ten years	2,950
Securities that do not have a single contractual maturity date	0
Amortized Cost	22,566	$ 10,176
Held-to-maturity Securities, Fair Value [Abstract]
One year or less	8,769
After one year to five years	5,999
After five years to ten years	4,341
After ten years	2,873
Securities that do not have a single contractual maturity date	0
Fair Value	$ 21,982

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities pledged	$ 1,700,000,000			$ 1,700,000,000		$ 1,200,000,000
Held-to-maturity securities pledged as collateral	0			0		0
Realized gains on securities available-for-sale	0		$ 0	0	$ 0
Proceeds from sales of securities available-for-sale		$ 93,300,000		93,332,000	0
Other-than-temporary securities impairment (OTTI)	$ 0		$ 0	$ 0	$ 0	$ 0

Securities - Securities In An U

Securities - Securities In An Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2019USD ($)security	Dec. 31, 2018USD ($)security
Securities Available-for-Sale
Number of Securities | security	253	882
Fair Value
Less Than 12 Months	$ 146,180	$ 501,061
12 Months or Longer	567,332	1,365,068
Total	713,512	1,866,129
Unrealized Losses
Less Than 12 Months	1,055	8,046
12 Months or Longer	3,972	36,270
Total	$ 5,027	$ 44,316
U.S. treasury securities
Securities Available-for-Sale
Number of Securities | security	5	17
Fair Value
Less Than 12 Months	$ 1,981	$ 15,894
12 Months or Longer	7,003	13,886
Total	8,984	29,780
Unrealized Losses
Less Than 12 Months	1	57
12 Months or Longer	3	118
Total	$ 4	$ 175
U.S. agency securities
Securities Available-for-Sale
Number of Securities | security	46	74
Fair Value
Less Than 12 Months	$ 62,206	$ 34,263
12 Months or Longer	60,746	93,227
Total	122,952	127,490
Unrealized Losses
Less Than 12 Months	447	320
12 Months or Longer	580	1,287
Total	$ 1,027	$ 1,607
CMOs
Securities Available-for-Sale
Number of Securities | security	105	234
Fair Value
Less Than 12 Months	$ 60,802	$ 171,901
12 Months or Longer	288,184	863,747
Total	348,986	1,035,648
Unrealized Losses
Less Than 12 Months	454	1,671
12 Months or Longer	1,592	23,013
Total	$ 2,046	$ 24,684
MBSs
Securities Available-for-Sale
Number of Securities | security	54	118
Fair Value
Less Than 12 Months	$ 10,104	$ 135,791
12 Months or Longer	167,952	284,273
Total	178,056	420,064
Unrealized Losses
Less Than 12 Months	38	1,715
12 Months or Longer	1,143	9,536
Total	$ 1,181	$ 11,251
Municipal securities
Securities Available-for-Sale
Number of Securities | security	35	423
Fair Value
Less Than 12 Months	$ 1,194	$ 60,863
12 Months or Longer	13,975	109,935
Total	15,169	170,798
Unrealized Losses
Less Than 12 Months	8	558
12 Months or Longer	37	2,316
Total	$ 45	$ 2,874
Securities Held-to-Maturity
Number of Securities | security	31	5
Fair Value
Less Than 12 Months	$ 12,467	$ 0
12 Months or Longer	9,515	9,871
Total	21,982	9,871
Unrealized Losses
Less Than 12 Months	331	0
12 Months or Longer	253	305
Total	$ 584	$ 305
Corporate debt securities
Securities Available-for-Sale
Number of Securities | security	8	16
Fair Value
Less Than 12 Months	$ 9,893	$ 82,349
12 Months or Longer	29,472	0
Total	39,365	82,349
Unrealized Losses
Less Than 12 Months	107	3,725
12 Months or Longer	617	0
Total	$ 724	$ 3,725

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 12,773,319	$ 11,446,783
Deferred loan fees included in total loans	7,233	6,715
Overdrawn demand deposits included in total loans	10,440	8,583
Commercial and industrial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,570,361	4,120,293
Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	417,740	430,928
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,772,869	4,596,249
Commercial real estate | Office, retail, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,892,877	1,820,917
Commercial real estate | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	817,444	764,185
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	637,256	649,337
Commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,425,292	1,361,810
Total corporate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,760,970	9,147,470
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,012,349	2,299,313
Consumer loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	833,955	851,607
Consumer loans | 1-4 family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,686,967	1,017,181
Consumer loans | Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 491,427	$ 430,525

Loans - Loans Sales (Details)

Loans - Loans Sales (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net gains on loan sales		$ 2,936	$ 1,341	$ 6,327	$ 4,475
Corporate loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		5,108	2,868	10,484	15,180
Less book value of loans sold		4,950	2,827	10,198	14,811
Total net gains on loan sales	[1]	158	41	286	369
1-4 family mortgage loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		143,776	62,576	297,967	193,476
Less book value of loans sold		140,998	61,276	291,926	189,370
Total net gains on loan sales	[2]	$ 2,778	$ 1,300	$ 6,041	$ 4,106
[1]	Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income.
[2]	Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income.

Acquired and Covered Loans - Ac

Acquired and Covered Loans - Acquired Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	$ 1,408,977	$ 1,252,361
Total	[1]	1,574,803	1,366,229
Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	1,404,960	1,247,492
Total	[1]	1,565,320	1,355,541
Covered loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCI	[1]	4,017	4,869
Total	[1]	9,483	10,688
Receivables acquired with deteriorated credit quality
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	165,826	113,868
Receivables acquired with deteriorated credit quality | Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	160,360	108,049
Receivables acquired with deteriorated credit quality | Covered loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCI	[1]	$ 5,466	$ 5,819
[1]	Included in loans in the Consolidated Statements of Financial Condition.

Acquired and Covered Loans - Ad

Acquired and Covered Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Outstanding balance of PCI loans	$ 244,800		$ 244,800		$ 175,200
Renewed non-purchased credit impaired loans	512,600		512,600		458,000
FDIC indemnification asset	1,200		1,200		$ 2,100
Accretion on acquired loans	5,759	$ 3,008	13,630	$ 9,548
Acquired and covered receivables
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Accretion on acquired loans	$ 9,200	$ 4,600	$ 25,900	$ 14,100

Acquired and Covered Loans - Ch

Acquired and Covered Loans - Changes in Accretable Yield (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes in Accretable Yield [Roll Forward]
Beginning balances		$ 50,885	$ 39,008	$ 43,725	$ 32,957
Additions		0	0	16,037	0
Accretion		(5,759)	(3,008)	(13,630)	(9,548)
Other	[1]	(613)	2,672	(1,619)	15,263
Ending balance		$ 44,513	$ 38,672	$ 44,513	$ 38,672
[1]	Increases represent a rise in the expected future cash flows to be collected over the remaining estimated life of the underlying portfolio, while decreases result from the resolution of certain loans occurring earlier than anticipated.

Past Due Loans, Allowance For_3

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Aging Analysis of Past Due Loans and Non-Performing Loans by Class (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Current	[1]	$ 12,671,812	$ 11,357,176
Total Past Due		101,507	89,607
Total Loans		12,773,319	11,446,783
Non-accrual		77,692	56,935
90 Days or More Past Due, Still Accruing Interest		4,657	8,282
30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		53,874	40,102
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		47,633	49,505
Commercial, Industrial, and Agricultural
Financing Receivable, Past Due [Line Items]
Total Loans		4,988,101	4,551,221
Commercial, Industrial, and Agricultural | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Current	[1]	4,537,236	4,085,164
Total Past Due		33,125	35,129
Total Loans		4,570,361	4,120,293
Non-accrual		26,739	33,507
90 Days or More Past Due, Still Accruing Interest		1,982	422
Commercial, Industrial, and Agricultural | Agricultural
Financing Receivable, Past Due [Line Items]
Current	[1]	404,731	428,357
Total Past Due		13,009	2,571
Total Loans		417,740	430,928
Non-accrual		6,242	1,564
90 Days or More Past Due, Still Accruing Interest		23	101
Commercial, Industrial, and Agricultural | 30-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due		20,929	8,832
Commercial, Industrial, and Agricultural | 30-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due		6,966	940
Commercial, Industrial, and Agricultural | 90 Days or More Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due		12,196	26,297
Commercial, Industrial, and Agricultural | 90 Days or More Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due		6,043	1,631
Commercial real estate
Financing Receivable, Past Due [Line Items]
Current	[1]	4,737,784	4,561,677
Total Past Due		35,085	34,572
Total Loans		4,772,869	4,596,249
Non-accrual		33,796	12,615
90 Days or More Past Due, Still Accruing Interest		1,175	6,467
Commercial real estate | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Current	[1]	1,869,816	1,803,059
Total Past Due		23,061	17,858
Total Loans		1,892,877	1,820,917
Non-accrual		26,812	6,510
90 Days or More Past Due, Still Accruing Interest		0	4,081
Commercial real estate | Multi-family
Financing Receivable, Past Due [Line Items]
Current	[1]	813,422	759,402
Total Past Due		4,022	4,783
Total Loans		817,444	764,185
Non-accrual		2,152	3,107
90 Days or More Past Due, Still Accruing Interest		0	189
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Current	[1]	635,270	645,774
Total Past Due		1,986	3,563
Total Loans		637,256	649,337
Non-accrual		152	144
90 Days or More Past Due, Still Accruing Interest		63	0
Commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Current	[1]	1,419,276	1,353,442
Total Past Due		6,016	8,368
Total Loans		1,425,292	1,361,810
Non-accrual		4,680	2,854
90 Days or More Past Due, Still Accruing Interest		1,112	2,197
Commercial real estate | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		12,781	18,036
Commercial real estate | 30-89 Days Past Due | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due		7,289	8,209
Commercial real estate | 30-89 Days Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Past Due		1,870	1,487
Commercial real estate | 30-89 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due		1,771	3,419
Commercial real estate | 30-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due		1,851	4,921
Commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		22,304	16,536
Commercial real estate | 90 Days or More Past Due | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due		15,772	9,649
Commercial real estate | 90 Days or More Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Past Due		2,152	3,296
Commercial real estate | 90 Days or More Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due		215	144
Commercial real estate | 90 Days or More Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due		4,165	3,447
Total corporate loans
Financing Receivable, Past Due [Line Items]
Current	[1]	9,679,751	9,075,198
Total Past Due		81,219	72,272
Total Loans		9,760,970	9,147,470
Non-accrual		66,777	47,686
90 Days or More Past Due, Still Accruing Interest		3,180	6,990
Total corporate loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		40,676	27,808
Total corporate loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		40,543	44,464
Consumer loans
Financing Receivable, Past Due [Line Items]
Current	[1]	2,992,061	2,281,978
Total Past Due		20,288	17,335
Total Loans		3,012,349	2,299,313
Non-accrual		10,915	9,249
90 Days or More Past Due, Still Accruing Interest		1,477	1,292
Consumer loans | Home equity
Financing Receivable, Past Due [Line Items]
Current	[1]	823,373	843,217
Total Past Due		10,582	8,390
Total Loans		833,955	851,607
Non-accrual		7,326	5,393
90 Days or More Past Due, Still Accruing Interest		175	104
Consumer loans | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Current	[1]	1,680,096	1,009,925
Total Past Due		6,871	7,256
Total Loans		1,686,967	1,017,181
Non-accrual		3,589	3,856
90 Days or More Past Due, Still Accruing Interest		0	1,147
Consumer loans | Installment
Financing Receivable, Past Due [Line Items]
Current	[1]	488,592	428,836
Total Past Due		2,835	1,689
Total Loans		491,427	430,525
Non-accrual		0	0
90 Days or More Past Due, Still Accruing Interest		1,302	41
Consumer loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		13,198	12,294
Consumer loans | 30-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due		6,373	6,285
Consumer loans | 30-89 Days Past Due | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due		5,292	4,361
Consumer loans | 30-89 Days Past Due | Installment
Financing Receivable, Past Due [Line Items]
Total Past Due		1,533	1,648
Consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		7,090	5,041
Consumer loans | 90 Days or More Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due		4,209	2,105
Consumer loans | 90 Days or More Past Due | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due		1,579	2,895
Consumer loans | 90 Days or More Past Due | Installment
Financing Receivable, Past Due [Line Items]
Total Past Due		$ 1,302	$ 41
[1]	PCI loans with an accretable yield are considered current.

Past Due Loans, Allowance For_4

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	$ 106,929	$ 97,691	$ 103,419	$ 96,729
Charge-offs	(11,272)	(9,264)	(33,473)	(37,658)
Recoveries	2,073	1,250	5,849	3,811
Net charge-offs	(9,199)	(8,014)	(27,624)	(33,847)
Provision for loan losses and other	12,498	11,248	34,433	38,043
Ending balance	110,228	100,925	110,228	100,925
Reserve for Unfunded Commitments
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	1,200	1,000	1,200	1,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision for loan losses and other	0	0	0	0
Ending balance	1,200	1,000	1,200	1,000
Commercial, Industrial, and Agricultural
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	66,364	60,043	63,276	55,791
Charge-offs	(7,176)	(6,277)	(20,143)	(29,609)
Recoveries	1,205	416	3,764	1,707
Net charge-offs	(5,971)	(5,861)	(16,379)	(27,902)
Provision for loan losses and other	5,002	6,776	18,498	33,069
Ending balance	65,395	60,958	65,395	60,958
Commercial Real Estate
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance			17,471
Ending balance	18,097		18,097
Commercial Real Estate | Office, Retail, and Industrial
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	7,495	9,062	7,900	10,996
Charge-offs	(293)	(759)	(2,526)	(1,525)
Recoveries	74	163	235	286
Net charge-offs	(219)	(596)	(2,291)	(1,239)
Provision for loan losses and other	65	15	1,732	(1,276)
Ending balance	7,341	8,481	7,341	8,481
Commercial Real Estate | Multi-family
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	2,159	2,175	2,464	2,534
Charge-offs	0	(1)	(340)	(5)
Recoveries	38	0	39	0
Net charge-offs	38	(1)	(301)	(5)
Provision for loan losses and other	565	200	599	(155)
Ending balance	2,762	2,374	2,762	2,374
Commercial Real Estate | Construction
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	1,862	2,124	2,173	3,481
Charge-offs	0	(1)	(6)	(1)
Recoveries	2	5	18	26
Net charge-offs	2	4	12	25
Provision for loan losses and other	(98)	116	(419)	(1,262)
Ending balance	1,766	2,244	1,766	2,244
Commercial Real Estate | Other Commercial Real Estate
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	4,997	4,631	4,934	6,381
Charge-offs	(184)	(177)	(723)	(247)
Recoveries	227	154	293	552
Net charge-offs	43	(23)	(430)	305
Provision for loan losses and other	1,188	740	1,724	(1,338)
Ending balance	6,228	5,348	6,228	5,348
Consumer
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance			21,472
Ending balance	25,536		25,536
Consumer | Consumer
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	22,852	18,656	21,472	16,546
Charge-offs	(3,619)	(2,049)	(9,735)	(6,271)
Recoveries	527	512	1,500	1,240
Net charge-offs	(3,092)	(1,537)	(8,235)	(5,031)
Provision for loan losses and other	5,776	3,401	12,299	9,005
Ending balance	$ 25,536	$ 20,520	$ 25,536	$ 20,520

Past Due Loans, Allowance For_5

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Loans and Related Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		$ 63,199		$ 42,509
Loans, Collectively Evaluated for Impairment		12,544,294		11,290,406
Loans		12,773,319		11,446,783
Allowance for Credit Losses Individually Evaluated for Impairment		3,173		4,709
Allowance for Credit Losses Collectively Evaluated for Impairment		103,831		94,578
Total Allowance for Credit Losses		110,228	$ 106,929	103,419	$ 100,925	$ 97,691	$ 96,729
PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI	[1]	165,826		113,868
Total Allowance for Credit Losses		3,224		4,132
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		31,169		32,415
Loans, Collectively Evaluated for Impairment		4,907,442		4,514,349
Loans		4,988,101		4,551,221
Allowance for Credit Losses Individually Evaluated for Impairment		2,556		3,961
Allowance for Credit Losses Collectively Evaluated for Impairment		62,465		58,947
Total Allowance for Credit Losses		65,395	66,364	63,276	60,958	60,043	55,791
Commercial and industrial | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		49,490		4,457
Total Allowance for Credit Losses		374		368
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		32,030		10,094
Loans, Collectively Evaluated for Impairment		4,647,466		4,496,277
Loans		4,772,869		4,596,249
Allowance for Credit Losses Individually Evaluated for Impairment		617		748
Allowance for Credit Losses Collectively Evaluated for Impairment		15,706		14,337
Total Allowance for Credit Losses		18,097		17,471
Commercial real estate | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		93,373		89,878
Total Allowance for Credit Losses		1,774		2,386
Total corporate loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		63,199		42,509
Loans, Collectively Evaluated for Impairment		9,554,908		9,010,626
Loans		9,760,970		9,147,470
Allowance for Credit Losses Individually Evaluated for Impairment		3,173		4,709
Allowance for Credit Losses Collectively Evaluated for Impairment		78,171		73,284
Total Allowance for Credit Losses		83,492		80,747
Total corporate loans | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		142,863		94,335
Total Allowance for Credit Losses		2,148		2,754
Consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		0		0
Loans, Collectively Evaluated for Impairment		2,989,386		2,279,780
Loans		3,012,349		2,299,313
Allowance for Credit Losses Individually Evaluated for Impairment		0		0
Allowance for Credit Losses Collectively Evaluated for Impairment		24,460		20,094
Total Allowance for Credit Losses		25,536		21,472
Consumer loans | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		22,963		19,533
Total Allowance for Credit Losses		1,076		1,378
Office, retail, and industrial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		26,255		5,057
Loans, Collectively Evaluated for Impairment		1,841,712		1,799,304
Loans		1,892,877		1,820,917
Allowance for Credit Losses Individually Evaluated for Impairment		522		748
Allowance for Credit Losses Collectively Evaluated for Impairment		6,696		5,984
Total Allowance for Credit Losses		7,341	7,495	7,900	8,481	9,062	10,996
Office, retail, and industrial | Commercial real estate | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		24,910		16,556
Total Allowance for Credit Losses		123		1,168
Multi-family | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		1,995		3,492
Loans, Collectively Evaluated for Impairment		809,711		747,030
Loans		817,444		764,185
Allowance for Credit Losses Individually Evaluated for Impairment		0		0
Allowance for Credit Losses Collectively Evaluated for Impairment		2,666		2,154
Total Allowance for Credit Losses		2,762	2,159	2,464	2,374	2,175	2,534
Multi-family | Commercial real estate | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		5,738		13,663
Total Allowance for Credit Losses		96		310
Construction | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		123		0
Loans, Collectively Evaluated for Impairment		623,689		644,499
Loans		637,256		649,337
Allowance for Credit Losses Individually Evaluated for Impairment		0		0
Allowance for Credit Losses Collectively Evaluated for Impairment		1,765		2,019
Total Allowance for Credit Losses		1,766	1,862	2,173	2,244	2,124	3,481
Construction | Commercial real estate | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		13,444		4,838
Total Allowance for Credit Losses		1		154
Other commercial real estate | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		3,657		1,545
Loans, Collectively Evaluated for Impairment		1,372,354		1,305,444
Loans		1,425,292		1,361,810
Allowance for Credit Losses Individually Evaluated for Impairment		95		0
Allowance for Credit Losses Collectively Evaluated for Impairment		4,579		4,180
Total Allowance for Credit Losses		6,228	4,997	4,934	5,348	4,631	6,381
Other commercial real estate | Commercial real estate | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		49,281		54,821
Total Allowance for Credit Losses		1,554		754
Reserve for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment		0		0
Loans, Collectively Evaluated for Impairment		0		0
Loans		0		0
Allowance for Credit Losses Individually Evaluated for Impairment		0		0
Allowance for Credit Losses Collectively Evaluated for Impairment		1,200		1,200
Total Allowance for Credit Losses		1,200	$ 1,200	1,200	$ 1,000	$ 1,000	$ 1,000
Reserve for unfunded commitments | PCI
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI		0		0
Total Allowance for Credit Losses		$ 0		$ 0
[1]	Included in loans in the Consolidated Statements of Financial Condition.

Past Due Loans, Allowance For_6

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Impaired Loans Individually Evaluated by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	$ 33,625	$ 15,766
Recorded Investment in Loans with a Specific Reserve	29,574	26,743
Unpaid Principal Balance	104,219	64,344
Specific Reserve	3,173	4,709
Commercial and industrial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	10,600	7,550
Recorded Investment in Loans with a Specific Reserve	14,540	23,349
Unpaid Principal Balance	50,231	49,102
Specific Reserve	1,636	3,960
Commercial and industrial | Agricultural
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	1,905	1,318
Recorded Investment in Loans with a Specific Reserve	4,124	198
Unpaid Principal Balance	9,566	3,997
Specific Reserve	920	1
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	21,120	6,898
Recorded Investment in Loans with a Specific Reserve	10,910	3,196
Unpaid Principal Balance	44,422	11,245
Specific Reserve	617	748
Commercial real estate | Office, retail, and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	16,440	1,861
Recorded Investment in Loans with a Specific Reserve	9,815	3,196
Unpaid Principal Balance	38,296	6,141
Specific Reserve	522	748
Commercial real estate | Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	1,995	3,492
Recorded Investment in Loans with a Specific Reserve	0	0
Unpaid Principal Balance	1,995	3,492
Specific Reserve	0	0
Commercial real estate | Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	123	0
Recorded Investment in Loans with a Specific Reserve	0	0
Unpaid Principal Balance	123	0
Specific Reserve	0	0
Commercial real estate | Other commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Reserve	2,562	1,545
Recorded Investment in Loans with a Specific Reserve	1,095	0
Unpaid Principal Balance	4,008	1,612
Specific Reserve	$ 95	$ 0

Past Due Loans, Allowance For_7

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Impaired Loans Individually Evaluated by Class (Continued) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 55,330	$ 43,683	$ 51,953	$ 49,930
Interest Income Recognized	[1]	175	307	258	1,304
Commercial and industrial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		21,111	28,082	26,275	34,440
Interest Income Recognized	[1]	74	123	100	159
Commercial and industrial | Agricultural
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		6,249	2,372	4,032	2,153
Interest Income Recognized	[1]	9	0	20	25
Commercial real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		27,970	13,229	21,646	13,337
Interest Income Recognized	[1]	92	184	138	1,120
Commercial real estate | Office, retail, and industrial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		20,773	6,641	15,611	8,867
Interest Income Recognized	[1]	2	105	6	873
Commercial real estate | Multi-family
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		3,578	3,757	3,456	2,132
Interest Income Recognized	[1]	48	11	48	66
Commercial real estate | Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		123	0	62	0
Interest Income Recognized	[1]	0	0	0	0
Commercial real estate | Other commercial real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		3,496	2,831	2,517	2,338
Interest Income Recognized	[1]	$ 42	$ 68	$ 84	$ 181
[1]	Recorded using the cash basis of accounting.

Past Due Loans, Allowance For_8

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Credit Quality Indicators by Class (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing TDRs		$ 1,422	$ 1,866
Special Mention and Substandard Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing TDRs		232,000	630
Total corporate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		9,760,970	9,147,470
Total corporate loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		9,336,861	8,758,739
Total corporate loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	185,369	194,180
Total corporate loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	171,963	146,865
Total corporate loans | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	66,777	47,686
Commercial and industrial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		4,570,361	4,120,293
Accruing TDRs		232	246
Commercial and industrial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		4,404,464	3,952,066
Commercial and industrial | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	63,434	74,878
Commercial and industrial | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	75,724	59,842
Commercial and industrial | Commercial and industrial | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	26,739	33,507
Commercial and industrial | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		417,740	430,928
Accruing TDRs		0	0
Commercial and industrial | Agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		373,757	407,542
Commercial and industrial | Agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	22,495	10,070
Commercial and industrial | Agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	15,246	11,752
Commercial and industrial | Agricultural | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	6,242	1,564
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		4,772,869	4,596,249
Accruing TDRs		338	738
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		4,558,640	4,399,131
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	99,440	109,232
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	80,993	75,271
Commercial real estate | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	33,796	12,615
Commercial real estate | Office, retail, and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		1,892,877	1,820,917
Accruing TDRs		0	0
Commercial real estate | Office, retail, and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		1,793,811	1,735,426
Commercial real estate | Office, retail, and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	41,332	35,853
Commercial real estate | Office, retail, and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	30,922	43,128
Commercial real estate | Office, retail, and industrial | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	26,812	6,510
Commercial real estate | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		817,444	764,185
Accruing TDRs		165	557
Commercial real estate | Multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		799,218	745,131
Commercial real estate | Multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	10,068	9,273
Commercial real estate | Multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	6,006	6,674
Commercial real estate | Multi-family | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	2,152	3,107
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		637,256	649,337
Accruing TDRs		0	0
Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		612,810	624,446
Commercial real estate | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	14,147	16,370
Commercial real estate | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	10,147	8,377
Commercial real estate | Construction | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	152	144
Commercial real estate | Other commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		1,425,292	1,361,810
Accruing TDRs		173	181
Commercial real estate | Other commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class		1,352,801	1,294,128
Commercial real estate | Other commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[1],[2]	33,893	47,736
Commercial real estate | Other commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[2],[3]	33,918	17,092
Commercial real estate | Other commercial real estate | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators by Class	[4]	$ 4,680	$ 2,854
[1]	Loans categorized as special mention exhibit potential weaknesses that require the close attention of management since these potential weaknesses may result in the deterioration of repayment prospects in the future.
[2]	Total special mention and substandard loans includes accruing TDR s of $232,000 as of September 30, 2019 and $630,000 as of December 31, 2018 .
[3]	Loans categorized as substandard exhibit well-defined weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well-secured, and collection of principal and interest is expected within a reasonable time.
[4]	Loans categorized as non-accrual exhibit well-defined weaknesses that may jeopardize the liquidation of the debt or result in a loss if the deficiencies are not corrected.

Past Due Loans, Allowance For_9

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Credit Quality Indicators by Class (Continued) (Details) - Consumer loans - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	$ 3,012,349	$ 2,299,313
Performing
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	3,001,434	2,290,064
Non-accrual
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	10,915	9,249
Home equity
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	833,955	851,607
Home equity | Performing
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	826,629	846,214
Home equity | Non-accrual
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	7,326	5,393
1-4 family mortgages
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	1,686,967	1,017,181
1-4 family mortgages | Performing
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	1,683,378	1,013,325
1-4 family mortgages | Non-accrual
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	3,589	3,856
Installment
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	491,427	430,525
Installment | Performing
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	491,427	430,525
Installment | Non-accrual
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) [Line Items]
Credit Quality Indicators by Class	$ 0	$ 0

Past Due Loans, Allowance Fo_10

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - TDRs By Class (Details) - USD ($)		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		$ 1,422,000	$ 1,866,000
Non-accrual	[1]	5,088,000	6,612,000
Total		6,510,000	8,478,000	$ 8,106,000
Specific reserves related to TDRs		0	0
Commercial and industrial | Commercial and industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		232,000	246,000
Non-accrual	[1]	4,561,000	5,994,000
Total		4,793,000	6,240,000
Commercial and industrial | Agricultural
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		0	0
Non-accrual	[1]	0	0
Total		0	0
Commercial real estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		338,000	738,000
Non-accrual	[1]	0	0
Total		338,000	738,000
Commercial real estate | Office, retail, and industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		0	0
Non-accrual	[1]	0	0
Total		0	0
Commercial real estate | Multi-family
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		165,000	557,000
Non-accrual	[1]	0	0
Total		165,000	557,000
Commercial real estate | Construction
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		0	0
Non-accrual	[1]	0	0
Total		0	0
Commercial real estate | Other commercial real estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		173,000	181,000
Non-accrual	[1]	0	0
Total		173,000	181,000
Total corporate loans
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		570,000	984,000
Non-accrual	[1]	4,561,000	5,994,000
Total		5,131,000	6,978,000
Consumer loans
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		852,000	882,000
Non-accrual	[1]	527,000	618,000
Total		1,379,000	1,500,000
Consumer loans | Home equity
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		107,000	113,000
Non-accrual	[1]	249,000	327,000
Total		356,000	440,000
Consumer loans | 1-4 family mortgages
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		745,000	769,000
Non-accrual	[1]	278,000	291,000
Total		1,023,000	1,060,000
Consumer loans | Installment
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing TDRs		0	0
Non-accrual	[1]	0	0
Total		$ 0	$ 0
[1]	These TDR s are included in non-accrual loans in the preceding tables.

Past Due Loans, Allowance Fo_11

Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - TDR Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance			$ 8,478
Ending balance	$ 6,510	$ 8,106	6,510	$ 8,106
Material commitments to lend additional funds to borrowers with TDRs	1,600		1,600		$ 3,800
Accruing
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	1,441	1,760	1,866	1,796
Additions	0	0	12	0
Net payments	(19)	(19)	(73)	(55)
Net transfers to non-accrual	0	0	(383)	0
Ending balance	1,422	1,741	1,422	1,741
Non-accrual
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	7,841	8,238	6,612	24,533
Additions	0	0	0	355
Net payments	(2,753)	(1,620)	(1,279)	(14,598)
Charge-offs	0	(253)	(628)	(3,925)
Net transfers from accruing	0	0	383	0
Ending balance	$ 5,088	$ 6,365	$ 5,088	$ 6,365

Lease Obligations - Narrative (

Lease Obligations - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2016USD ($)branch	Sep. 30, 2019USD ($)	Jan. 01, 2019USD ($)		Jan. 01, 2018USD ($)	[2]
Leases [Abstract]
Operating lease, weighted average remaining lease term			10 years 9 months 14 days
Operating lease, weighted average discount rate (as a percent)			3.20%
Operating lease, right-of-use asset			$ 139,500	$ 143,600
Lessee, Lease, Description [Line Items]
Sale and leaseback transaction, number of branches sold | branch		55
Sale and leaseback transaction, pre-tax gain	$ 65,500	$ 88,000
Sale and leaseback transaction related expenses		$ 5,500
Adjustments to apply recent accounting pronouncements				47,257	[1]	$ 0
Retained Earnings
Lessee, Lease, Description [Line Items]
Adjustments to apply recent accounting pronouncements				$ 47,257	[1]	$ 6,689
[1]	As a result of accounting guidance adopted in the first quarter of 2019, the remaining deferred gain on a sale-leaseback transaction was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2019. For further discussion of this guidance, see Note 2 , " Recent Accounting Pronouncements ."
[2]	As a result of accounting guidance adopted in the first quarter of 2018, certain reclassifications were made from accumulated other comprehensive income (loss) to retained earnings as of January 1, 2018.

Lease Obligations - Schedule of

Lease Obligations - Schedule of Lease Liability (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019	$ 4,059
2020	17,736
2021	17,611
2022	17,618
2023	17,752
2024 and thereafter	115,842
Total minimum lease payments	190,618
Discount	(30,783)	[1]
Lease liability	$ 159,835	[2]
[1]	Represents the net present value adjustment related to minimum lease payments.
[2]	Included in accrued interest payable and other liabilities in the Consolidated Statements of Financial Condition.

Lease Obligations - Schedule _2

Lease Obligations - Schedule of Net Operating Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Lease expense charged to operations		$ 4,467	$ 4,730	$ 12,953	$ 14,673
Accretion of operating lease intangible	[1]		(211)		(716)
Accretion of deferred gain on sale-leaseback transaction	[1]		(1,463)		(4,389)
Rental income from premises leased to others	[1]	(203)	(122)	(525)	(384)
Net operating lease expense		$ 4,264	$ 2,934	$ 12,428	$ 9,184
[1]	Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income.

Material Transactions Affecti_2

Material Transactions Affecting Stockholders' Equity (Details) - USD ($)	Mar. 19, 2019	Sep. 30, 2019	Sep. 30, 2019
Equity [Abstract]
Stock repurchase program, authorized amount	$ 180,000,000
Stock repurchase program, term	1 year
Common stock repurchased (in shares)		645,000	1,700,000
Total cost of common stock repurchased		$ 12,700,000	$ 33,900,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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		$ 54,545	$ 53,352	$ 147,617	$ 116,462
Net income applicable to non-vested restricted shares		(465)	(441)	(1,257)	(992)
Net income applicable to common shares		$ 54,080	$ 52,911	$ 146,360	$ 115,470
Weighted-average common shares outstanding:
Weighted-average common shares outstanding (basic) (in Shares)		109,281	102,178	107,852	102,087
Dilutive effect of common stock equivalents (in Shares)		381	0	394	5
Weighted-average diluted common shares outstanding (in Shares)		109,662	102,178	108,246	102,092
Basic EPS (in dollars per share)		$ 0.49	$ 0.52	$ 1.36	$ 1.13
Diluted EPS (in dollars per share)		$ 0.49	$ 0.52	$ 1.35	$ 1.13
Anti-dilutive shares not included in the computation of diluted EPS (in Shares)	[1]	0	0	0	36
[1]	This amount represents outstanding stock options for which the exercise price is greater than the average market price of the Company's common stock. The final outstanding stock options were exercised during the first quarter of 2018.

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 03, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of variable rate loans hedged using interest rate swaps	$ 815,000		$ 815,000
Amount hedged of borrowed funds using forward starting interest rate swaps	1,100,000		1,100,000		$ 510,000
Amount to be hedged of borrowed funds using forward starting interest rate swaps	$ 555,000		$ 555,000
Weighted-average interest rate to be paid	2.16%		2.16%
Interest rate cash flow hedge loss to be reclassified during next 12 months, net	$ (1,400)		$ (1,400)
Capital market products income	$ 4,161	$ 1,936	$ 7,594	$ 6,313
Portion of fair value of outstanding interest rate swaps covered by collateral agreements (percent)	100.00%		100.00%			100.00%

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross notional amount outstanding		$ 1,880,000	$ 2,280,000
Derivative asset fair value in other assets	[1]	2,059	6,889
Derivative liability fair value in other liabilities	[1]	$ (205)	$ (11,328)
Weighted-average interest rate received		2.02%	2.12%
Weighted-average interest rate paid		1.97%	2.20%
Weighted-average maturity (in years)		1 year 4 months 28 days	1 year 6 months 10 days
[1]	Certain cash flow hedges are transacted through a clearinghouse ("centrally cleared") and their change in fair value is settled by the counterparties to the transaction, which results in no fair value.

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Other Derivative Instruments (Details) - Other Derivative Instruments - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross notional amount outstanding		$ 3,738,566	$ 3,085,226
Derivative asset fair value in other assets	[1]	80,156	25,168
Derivative liability fair value in other liabilities	[1]	(25,137)	(17,533)
Fair value of derivative	[2]	$ 25,346	$ 18,013
[1]	Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value.
[2]	This amount represents the fair value if credit risk related contingent features were triggered.

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Cash Flow Hedge Accounting on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	$ (399)		$ 3,500
Interest Income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	2,218	$ 2,578	11,515	$ 13,151
Reclassification of gains (losses) included in net income	824	857	3,572	1,504
Interest Expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	(1,625)	(1,577)	(13,621)	(11,620)
Reclassification of gains (losses) included in net income	$ (1,018)	$ (978)	$ (4,966)	$ (2,087)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Effect Of Derivatives On Interest Income (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (194)	$ (121)	$ (1,394)	$ (583)
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	824	857	3,572	1,504
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (1,018)	$ (978)	$ (4,966)	$ (2,087)

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Assets
Gross amounts recognized		$ 82,215	$ 32,057
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	82,215	32,057
Offsetting derivative positions		(3,668)	(11,678)
Cash collateral pledged		0	(9,060)
Net credit exposure		78,547	11,319
Liabilities
Gross amounts recognized		25,342	28,861
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	25,342	28,861
Offsetting derivative positions		(3,668)	(11,678)
Cash collateral pledged		(16,557)	(3,506)
Net credit exposure		$ 5,117	$ 13,677
[1]	Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.

Commitments, Guarantees, and _3

Commitments, Guarantees, and Contingent Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Letters of credit		$ 104,286	$ 112,728
Commitments to extend credit
Other Commitments [Line Items]
Commercial, industrial, and agricultural		1,748,889	1,729,286
Commercial real estate		327,821	296,882
Home equity		571,389	570,553
Other commitments	[1]	254,689	244,917
Total commitments to extend credit		$ 2,902,788	$ 2,841,638
[1]	Other commitments includes installment and overdraft protection program commitments.

Fair Value - Recurring Fair Val

Fair Value - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2019		Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	Dec. 31, 2017
Assets
Equity securities		$ 40,723			$ 30,806
Securities Available-for-Sale
Securities available-for-sale, at fair value		2,905,738			2,272,009
Mortgage servicing rights (MSRs)		5,682	[1]	$ 5,831	6,730	$ 6,817		$ 6,671	$ 5,894
U.S. treasury securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		41,085			37,767
U.S. agency securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		244,087			142,563
CMOs
Securities Available-for-Sale
Securities available-for-sale, at fair value		1,590,553			1,315,209
MBSs
Securities Available-for-Sale
Securities available-for-sale, at fair value		677,507			466,934
Municipal securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		237,434			227,187
Corporate debt securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		115,072			82,349
Recurring | Level 1
Assets
Equity securities		22,511			19,658
Securities Available-for-Sale
Securities available-for-sale, at fair value		41,085			37,767
Mortgage servicing rights (MSRs)	[2]	0			0
Derivative assets	[2]	0			0
Liabilities
Derivative liabilities	[3]	0			0
Recurring | Level 1 | U.S. treasury securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		41,085			37,767
Recurring | Level 1 | U.S. agency securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 1 | CMOs
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 1 | MBSs
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 1 | Municipal securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 1 | Corporate debt securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 2
Assets
Equity securities		13,174			11,148
Securities Available-for-Sale
Securities available-for-sale, at fair value		2,864,653			2,234,242
Mortgage servicing rights (MSRs)	[2]	0			0
Derivative assets	[2]	82,215			32,057
Liabilities
Derivative liabilities	[3]	25,342			28,861
Recurring | Level 2 | U.S. treasury securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 2 | U.S. agency securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		244,087			142,563
Recurring | Level 2 | CMOs
Securities Available-for-Sale
Securities available-for-sale, at fair value		1,590,553			1,315,209
Recurring | Level 2 | MBSs
Securities Available-for-Sale
Securities available-for-sale, at fair value		677,507			466,934
Recurring | Level 2 | Municipal securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		237,434			227,187
Recurring | Level 2 | Corporate debt securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		115,072			82,349
Recurring | Level 3
Assets
Equity securities		0			0
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Mortgage servicing rights (MSRs)	[2]	5,682			6,730
Derivative assets	[2]	0			0
Liabilities
Derivative liabilities	[3]	0			0
Recurring | Level 3 | U.S. treasury securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 3 | U.S. agency securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 3 | CMOs
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 3 | MBSs
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 3 | Municipal securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		0			0
Recurring | Level 3 | Corporate debt securities
Securities Available-for-Sale
Securities available-for-sale, at fair value		$ 0			$ 0
[1]	Included in other assets in the Consolidated Statements of Financial Condition.
[2]	Included in other assets in the Consolidated Statements of Financial Condition.
[3]	Included in other liabilities in the Consolidated Statements of Financial Condition.

Fair Value - Significant Unobse

Fair Value - Significant Unobservable Inputs Used In the Valuation of MSRs (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Total amount of loans being serviced for the benefit of others at the end of the period	$ 652.2	$ 627.3
Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Prepayment speed	6.00%	6.50%
Maturity (months)	17 months	20 months
Discount rate	9.00%	9.50%
Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Prepayment speed	10.60%	13.50%
Maturity (months)	89 months	104 months
Discount rate	12.00%	12.00%

Fair Value - Carrying Value of

Fair Value - Carrying Value of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 5,831	$ 6,671	$ 6,730	$ 5,894
New MSRs		404	324	861	893
Total gains (losses) included in earnings:
Changes in valuation inputs and assumptions	[1]	(284)	65	(1,273)	627
Other changes in fair value	[1],[2]	(269)	(243)	(636)	(597)
Ending balance	[3]	5,682	6,817	5,682	6,817
Contractually servicing fees earned	[1]	$ 404	$ 375	$ 1,175	$ 1,122
[1]	Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2019 and 2018 .
[2]	Primarily represents changes in expected future cash flows due to payoffs and paydowns.
[3]	Included in other assets in the Consolidated Statements of Financial Condition.

Fair Value - Assets Measured At

Fair Value - Assets Measured At Fair Value On A Non-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]
OREO		$ 12,428	$ 12,821
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	[1]	0	0
OREO	[2]	0	0
Loans held-for-sale	[3]	0	0
Assets held-for-sale	[4]	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	[1]	0	0
OREO	[2]	0	0
Loans held-for-sale	[3]	0	0
Assets held-for-sale	[4]	0	0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	[1]	35,984	24,565
OREO	[2]	3,461	6,012
Loans held-for-sale	[3]	47,455	3,478
Assets held-for-sale	[4]	$ 8,626	$ 3,722
[1]	Includes impaired loans with charge-offs and impaired loans with a specific reserve during the periods presented.
[2]	Includes OREO with fair value adjustments subsequent to initial transfer that occurred during the periods presented.
[3]	Included in other assets in the Consolidated Statements of Financial Condition.
[4]	Included in premises, furniture, and equipment in the Consolidated Statements of Financial Condition.

Fair Value - Narrative (Details

Fair Value - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value (Details) [Line Items]
Equity securities, at fair value	$ 40,723	$ 30,806
Minimum
Fair Value (Details) [Line Items]
Appraisal adjustment (percent)	0.00%
Maximum
Fair Value (Details) [Line Items]
Appraisal adjustment (percent)	15.00%
Recurring | Level 2
Fair Value (Details) [Line Items]
Equity securities, at fair value	$ 13,174	$ 11,148
Community Development Investments | Recurring | Level 2
Fair Value (Details) [Line Items]
Equity securities, at fair value	$ 5,000

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurements of Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 273,613	$ 211,189
Interest-bearing deposits in other banks	202,054	78,069
Securities held-to-maturity	22,566	10,176
FHLB and FRB stock	112,845	80,302
Loans	12,664,291	11,344,564
Investment in BOLI	297,610	296,733
Liabilities
Deposits	13,440,927	12,084,112
Borrowed funds	1,653,490	906,079
Senior and subordinated debt	233,743	203,808
Carrying Amount | Level 1
Assets
Cash and due from banks	273,613	211,189
Carrying Amount | Level 2
Assets
Interest-bearing deposits in other banks	202,054	78,069
Securities held-to-maturity	22,566	10,176
FHLB and FRB stock	112,845	80,302
Liabilities
Deposits	13,440,927	12,084,112
Borrowed funds	1,653,490	906,079
Senior and subordinated debt	233,743	203,808
Accrued interest payable	12,000	10,005
Carrying Amount | Level 3
Assets
Loans	12,665,485	11,346,668
Investment in BOLI	297,610	296,733
Accrued interest receivable	58,223	54,847
Fair Value | Level 1
Assets
Cash and due from banks	273,613	211,189
Fair Value | Level 2
Assets
Interest-bearing deposits in other banks	202,054	78,069
Securities held-to-maturity	21,982	9,871
FHLB and FRB stock	112,845	80,302
Liabilities
Deposits	13,438,885	12,064,604
Borrowed funds	1,653,490	906,079
Senior and subordinated debt	276,715	211,207
Accrued interest payable	12,000	10,005
Fair Value | Level 3
Assets
Loans	12,561,148	11,052,040
Investment in BOLI	297,610	296,733
Accrued interest receivable	$ 58,223	$ 54,847