CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows Provided by (Used in) Operating Activities
Net income	$ 37,816	$ 15,364
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	(6,796)	17,216
Amortization of intangible assets	2,401	2,557
Amortization of mortgage servicing rights	1,616	1,276
Depreciation and amortization of premises and equipment	2,808	3,165
Net amortization (accretion) of premium (discount) on portfolio loans	(1,947)	(2,487)
Net amortization (accretion) of premium (discount) on investment securities	4,554	1,869
Net amortization (accretion) of premium (discount) on time deposits	(246)	(374)
Net amortization (accretion) of premium (discount) on FHLB advances and other borrowings	214	93
Impairment of mortgage servicing rights	(508)	177
Change in fair value of equity securities, net	(1,616)	987
(Gain) loss on sales of equity securities, net		(18)
(Gain) loss on sales of debt securities, net	(25)	(1,556)
(Gain) loss on sales of loans, net	(3,369)	(3,900)
(Gain) loss on sales of OREO	(1)	1
(Gain) loss on sales of premises and equipment	(134)	37
(Gain) loss on life insurance proceeds		(14)
Provision for deferred income taxes	2,448	1,722
Stock-based and non-cash compensation	1,448	1,139
(Increase) decrease in cash surrender value of bank owned life insurance	(964)	(1,043)
Mortgage loans originated for sale	(91,479)	(182,203)
Proceeds from sales of mortgage loans	98,307	165,008
Net change in operating assets and liabilities:
(Increase) decrease in other assets	260	991
Increase (decrease) in other liabilities	750	(1,194)
Net cash provided by (used in) operating activities	45,537	18,813
Cash Flows Provided by (Used in) Investing Activities
Purchases of equity securities	(998)
Purchases of debt securities available for sale	(789,884)	(273,992)
Proceeds from sales of equity securities	998	29
Proceeds from paydowns and maturities of debt securities available for sale	207,490	158,536
Net (increase) decrease in loans	36,501	(64,338)
Cash paid for premiums on bank-owned life insurance	(97)	(111)
Purchases of premises and equipment	(1,911)	(2,314)
Proceeds from life insurance		274
Proceeds from disposition of premises and equipment	1,759	607
Proceeds from sales of OREO	294	81
Net cash provided by (used in) investing activities	(545,848)	(181,228)
Cash Flows Provided by (Used in) Financing Activities
Net increase (decrease) in deposits	196,244	71,211
Net change in federal funds purchased and securities sold under agreements to repurchase	34,518	(38,241)
Proceeds from other borrowings		20,000
Repayment of other borrowings		(54,000)
Repayment of FHLB advances	(163)	(1,193)
Cash dividends paid	(12,513)	(12,055)
Purchase of treasury stock	(1,510)	(9,672)
Cash paid for withholding taxes on stock-based payments		(75)
Net cash provided by (used in) financing activities	216,576	(24,025)
Net increase (decrease) in cash and cash equivalents	(283,735)	(186,440)
Cash and cash equivalents, beginning of period	688,537	529,288
Cash and cash equivalents, ending of period	404,802	342,848
Cash Payments for:
Interest	1,767	14,391
Income taxes		500
Non-cash Investing and Financing Activities:
OREO acquired in settlement of loans	$ 14	$ 578