CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities
Net income	$ 41,170	$ 49,554
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	30,107	4,628
Amortization of intangible assets	5,076	4,506
Amortization of mortgage servicing rights	2,625	1,222
Depreciation and amortization of premises and equipment	6,316	5,674
Net amortization (accretion) of premium (discount) on portfolio loans	(4,663)	(5,729)
Net amortization (accretion) of premium (discount) on investment securities	4,061	2,843
Net amortization (accretion) of premium (discount) on time deposits	(709)	(802)
Net amortization (accretion) of premium (discount) on Federal Home Loan Bank ("FHLB") advances and other borrowings	220	125
Impairment of other real estate owned ("OREO")		54
Impairment of fixed assets held for sale	36
Impairment of mortgage servicing rights	526	1,822
Impairment of leases		415
Change in fair value of equity securities, net	797	800
(Gain) loss on equity securities		(8)
(Gain) loss on sales of debt securities, net	(1,699)	192
(Gain) loss on sale of loans, net	11,387	5,615
(Gain) loss on sale of OREO	47	(86)
(Gain) loss on sale of premises and equipment	191	116
(Gain) loss on life insurance proceeds	(1,256)	(1,016)
Provision for deferred income taxes	(1,142)	3,816
Stock-based and non-cash compensation	2,208	2,031
Decrease in deferred compensation		(6,781)
Increase in cash surrender value of bank owned life insurance	(2,083)	(2,064)
Mortgage loans originated for sale	(511,670)	(245,581)
Proceeds from sales of mortgage loans	483,238	239,252
Net change in operating assets and liabilities:
Decrease (increase) in other assets	12,225	822
(Decrease) increase in other liabilities	496	(12,826)
Net cash (used in) provided by operating activities	54,730	37,364
Cash Flows from Investing Activities
Purchase of equity securities	(4)
Purchases of debt securities available for sale	(356,700)	(227,182)
Purchase of FHLB stock		(3,700)
Proceeds from sales of equity securities	33	958
Proceeds from sales of debt securities available for sale		227,371
Proceeds from paydowns and maturities of debt securities held to maturity		13,922
Proceeds from paydowns and maturities of debt securities available for sale	315,988	146,566
Proceeds from the redemption of FHLB stock		3,720
Net cash (received) paid in acquisitions		(49,387)
Net change in loans	(546,599)	(89,642)
Cash paid for premiums on bank-owned life insurance	(116)	(3)
Purchases of premises and equipment	(3,029)	(5,918)
Proceeds from life insurance	2,512	1,672
Proceeds from disposition of premises and equipment	802	3
Capitalized expenditures on OREO		(2)
Proceeds from sale of OREO	413	1,119
Net cash (used in) provided by investing activities	(586,700)	19,497
Cash Flows from Financing Activities
Net change in deposits	1,007,979	145,499
Net change in federal funds purchased and securities sold under agreements to repurchase	(11,242)	(45,549)
Proceeds from other borrowings	142,634	60,000
Repayment of other borrowings	(54,000)	(3,000)
Net change in short-term FHLB advances	1,609	(2,297)
Cash dividends paid	(24,023)	(21,947)
Purchase of treasury stock	(9,669)	(8,433)
Cash paid for withholding taxes on share-based payments	(635)	(835)
Proceeds from stock options exercised	101	169
Common stock issuance costs		(234)
Net cash (used in) provided by financing activities	1,052,754	123,373
Net (decrease) increase in cash and cash equivalents	520,784	180,234
Cash and cash equivalents, beginning of period	529,288	239,973
Cash and cash equivalents, ending of period	1,050,072	420,207
Cash Payments for:
Interest	25,761	33,122
Income taxes	4,510	10,555
Non-cash Investing and Financing Activities:
OREO acquired in settlement of loans	$ 1,158	1,396
Transfer of debt securities held to maturity to available for sale		$ 573,639