Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 92,842	$ 68,331
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,891	3,044
Benefit for credit losses	(3,410)	(2,623)
Deferred income taxes	4,644	4,025
Net amortization of debt securities	3,157	3,926
Net accretion on loan discount/premiums	(633)	(1,386)
Amortization of intangible assets	2,758	2,726
Amortization of servicing assets	1,693	234
Mortgage loans originated-for-sale	(43,352)	(87,299)
Proceeds from mortgage loans sold	44,789	94,327
Sale of other real estate	71	(596)
Sale of state tax credits	(41)	(96)
Share-based compensation	3,806	2,783
Changes in other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net	5,534	(22,401)
Net cash provided by operating activities	114,749	64,995
Cash flows from investing activities:
Net increase in loans	(251,381)	(9,370)
Paydown or maturity of debt securities, available-for-sale	127,119	131,948
Paydown or maturity of debt securities, held-to-maturity	8,671	32,698
Redemption of other investments	3,376	2,213
Sale of state tax credits held for sale	3,641	4,262
Sale of other real estate	1,834	5,542
Settlement of bank-owned life insurance policies	534	0
Payments for the purchase of:
Available-for-sale debt securities	(544,909)	(316,743)
Held-to-maturity debt securities	(83,283)	0
Other investments	(19,437)	(4,729)
State tax credits held for sale	(7,352)	(3,285)
Fixed assets	(1,004)	(847)
Net cash used in investing activities	(762,191)	(158,311)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	168,042	399,753
Net (decrease) increase in interest-bearing deposit accounts	(419,223)	254,362
Repayments of notes payable	(2,857)	(4,286)
Net decrease in other borrowings	(124,311)	(62,285)
Repurchase of common stock	(32,923)	(11,833)
Cash dividends paid on common stock	(16,100)	(11,261)
Cash dividends paid on preferred stock	(2,167)	0
Other	96	154
Net cash (used in) provided by financing activities	(429,443)	564,604
Net (decrease) increase in cash and cash equivalents	(1,076,885)	471,288
Cash and cash equivalents, beginning of period	2,021,689	537,703
Cash and cash equivalents, end of period	944,804	1,008,991
Noncash investing and financing transactions:
Cash paid during the period for interest	11,873	11,897
Cash paid during period for income taxes	14,889	34,571
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	4,178	0
Transfer of securities from available-for-sale to held-to-maturity	$ 116,927	$ 0