Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Cash flows from operating activities:
Net income	$ 143,042	$ 82,244
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	4,268	4,609
Provision (benefit) for credit losses	(2,734)	17,045
Deferred income taxes	1,796	(8,813)
Net amortization of debt securities	4,488	5,704
Net accretion on loan discount/premiums	(289)	(1,672)
Amortization of intangible assets	4,068	4,199
Amortization of servicing assets	2,195	690
Mortgage loans originated-for-sale	(57,281)	(120,700)
Proceeds from mortgage loans sold	63,266	128,687
Sale of other real estate	93	(931)
Sale of fixed assets	(44)	0
Sale of state tax credits	(154)	(437)
Asset impairment	0	3,441
Share-based compensation	5,928	4,108
Changes in other assets and liabilities, net
Changes in other assets and liabilities, net	19,215	(12,544)
Net cash provided by operating activities	187,857	105,630
Cash flows from investing activities:
Proceeds from acquisition, net	0	212,642
Net (increase) decrease in loans	(337,863)	42,865
Sale of debt securities, available-for-sale	0	27,135
Paydown or maturity of debt securities, available-for-sale	183,230	222,993
Paydown or maturity of debt securities, held-to-maturity	10,819	42,874
Redemption of other investments	8,304	16,952
Sale of state tax credits held for sale	8,406	5,534
Sale of other real estate	2,517	5,915
Sale of fixed assets	1,489	0
Settlement of bank-owned life insurance policies	534	0
Payments for the purchase of:
Available-for-sale debt securities	(635,733)	(547,526)
Held-to-maturity debt securities	(115,697)	0
Other investments	(17,963)	(7,629)
State tax credits held for sale	(18,846)	(6,688)
Fixed assets	(1,321)	(1,635)
Net cash (used in) provided by investing activities	(912,124)	13,432
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	64,103	666,480
Net (decrease) increase in interest-bearing deposit accounts	(350,308)	335,477
Repayments of long-term FHLB advances	(50,000)	0
Net decrease in FHLB advances	0	(160,000)
Repayments of notes payable	(4,286)	(5,714)
Net decrease in other borrowings	(152,155)	(51,597)
Repurchase of common stock	(32,923)	(33,069)
Cash dividends paid on common stock	(24,662)	(18,566)
Cash dividends paid on preferred stock	(3,104)	0
Other	789	(489)
Net cash (used in) provided by financing activities	(552,546)	732,522
Net (decrease) increase in cash and cash equivalents	(1,276,813)	851,584
Cash and cash equivalents, beginning of period	2,021,689	537,703
Cash and cash equivalents, end of period	744,876	1,389,287
Noncash investing and financing transactions:
Cash paid during the period for interest	22,517	16,679
Cash paid during period for income taxes	30,505	45,230
Transfer to other real estate owned in settlement of loans	0	3,227
Sales of other real estate financed	0	228
Right-of-use assets obtained in exchange for lease obligations	$ 9,072	$ 4,319
Common shares issued in connection with acquisition	0	343,650
Transfer of securities from available-for-sale to held-to-maturity	$ 116,927	$ 0