CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows Provided by (Used in) Operating Activities
Net income	$ 28,439	$ 37,816
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	(253)	(6,796)
Amortization of intangible assets	3,011	2,401
Amortization of mortgage servicing rights	980	1,616
Amortization of NMTC	1,341	1,829
Depreciation and amortization of premises and equipment	2,756	2,808
Net amortization (accretion) on portfolio loans	(36)	(3,375)
Net amortization (accretion) of premium (discount) on investment securities	5,930	4,554
Net amortization (accretion) of premium (discount) on time deposits	(124)	(246)
Net amortization (accretion) of premium (discount) on FHLB advances and other borrowings	212	214
Impairment of OREO and other repossessed assets	611
Impairment of mortgage servicing rights	(9)	(508)
Unrealized (gains) losses recognized on equity securities	720	(1,616)
(Gain) loss on sales of debt securities, net	(106)	(25)
(Gain) loss on sales of loans, net	(1,089)	(3,369)
(Gain) loss on sales of OREO		(1)
(Gain) loss on sales of premises and equipment	(838)	(134)
(Gain) loss on life insurance proceeds	1
(Increase) decrease in cash surrender value of bank owned life insurance	(885)	(964)
Provision for deferred income taxes	(157)	2,448
Stock-based compensation	1,909	1,448
Mortgage loans originated for sale	(33,506)	(91,479)
Proceeds from sales of mortgage loans	51,350	98,307
Net change in operating assets and liabilities:
(Increase) decrease in other assets	(16,429)	(1,569)
Increase (decrease) in other liabilities	(1,323)	750
Net cash provided by (used in) operating activities	42,505	44,109
Cash Flows Provided by (Used in) Investing Activities
Purchases of equity securities	(5,948)	(998)
Purchases of debt securities available for sale	(274,964)	(789,884)
Proceeds from sales of equity securities		998
Proceeds from paydowns and maturities of debt securities held to maturity	9,585
Proceeds from paydowns and maturities of debt securities available for sale	166,709	207,490
Net (increase) decrease in loans	(83,392)	37,929
Cash paid for premiums on bank-owned life insurance	(96)	(97)
Proceeds from life insurance	217
Purchases of premises and equipment	(734)	(1,911)
Proceeds from disposition of premises and equipment	1,305	1,759
Proceeds from sales of OREO	331	294
Net cash provided by (used in) investing activities	(186,987)	(544,420)
Cash Flows Provided by (Used in) Financing Activities
Net increase (decrease) in deposits	(176,617)	196,244
Net change in federal funds purchased and securities sold under agreements to repurchase	(14,471)	34,518
Repayment of FHLB advances	(168)	(163)
Repayment of other borrowings	(3,000)
Cash dividends paid	(12,739)	(12,513)
Purchase of treasury stock	(5,220)	(1,510)
Cash paid for withholding taxes on stock-based payments	(170)
Net cash provided by (used in) financing activities	(212,385)	216,576
Net increase (decrease) in cash and cash equivalents	(356,867)	(283,735)
Cash and cash equivalents, beginning of period	836,095	688,537
Cash and cash equivalents, ending of period	479,228	404,802
Cash payments for:
Interest	3,647	$ 5,168
Non-cash investing and financing activities:
OREO acquired in settlement of loans	132
Transfer of debt securities available for sale to held to maturity	$ 985,199