Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 54,287	$ 8,099
Adjustments to reconcile income to net cash provided by operating activities:
Provision for credit losses	7,782	8,700
Depreciation	3,423	3,385
Deferred tax expense	54	0
Amortization of net premium on securities	523	1,226
Accretion of net discount on acquired loans	(1,695)	(1,104)
Net change in deferred loan origination fees and costs	(485)	1,689
Amortization of core deposits and other intangible assets	3,094	1,262
Amortization of software implementation costs	368	437
Amortization of premium on acquired deposits	(540)	(396)
Accretion of discount on subordinated debt	127	127
Amortization of issuance costs on subordinated debt	73	71
Accretion of discount on convertible notes payable	76	1,055
Accretion of discount (amortization of premium) on Federal Home Loan Bank advances	0	44
Increase in cash surrender value of bank-owned life insurance	(932)	(765)
Impairment of premises and equipment	0	720
Impairment of other real estate owned and foreclosed assets	285	21
Federal Home Loan Bank stock dividends	(1,158)	(136)
Share-based compensation expense	1,083	620
Decrease (increase) in fair value of mortgage servicing rights	651	(10,463)
Net loss on disposal of premises and equipment	17	84
Net gain on other real estate owned and foreclosed assets activity	0	(9)
Net gain on sales of loans held-for-sale	(2,217)	(9,990)
Origination of loans held-for-sale	(433,293)	(616,115)
Proceeds from sales of loans held-for-sale	431,540	663,522
Changes in operating assets and liabilities:
Lease right-of-use assets	(243)	0
Accrued interest receivable	(921)	(1,595)
Prepaid expenses and other assets	(10,213)	(18,504)
Accrued interest payable	7,744	(45)
Accrued expenses and other liabilities	3,740	747
Deferred tax assets	2,341	669
Net cash provided by (used in) operating activities	65,511	33,356
Cash flows from investing activities:
Cash acquired in excess of cash paid in connection with Pioneer Merger	0	444,541
Proceeds from maturities of held-to-maturity securities	1,060	2,359
Purchases of available-for-sale securities	(1,757)	(66,606)
Proceeds from sale or maturities of available-for-sale securities	18,470	136,952
Loan originations, net of repayments	(245,914)	(540,552)
Purchases of premises and equipment	(1,211)	(1,058)
Proceeds from the sale of premises and equipment	45	2
Proceeds from sales of other real estate owned and foreclosed assets	0	713
Purchases of restricted equity securities	(18,529)	(10,575)
Proceeds from the sale or redemption of restricted equity securities	23,537	8,432
Purchase of other investments	(948)	0
Proceeds from the sale or redemption of other investments	158	500
Net cash used in investing activities	(225,089)	(25,292)
Cash flows from financing activities:
Net change in deposits	385,895	(113,611)
Net change in securities sold under agreements to repurchase	(3,861)	(21,255)
Proceeds from Federal Home Loan Bank advances	1,107,000	0
Repayments of Federal Home Loan Bank advances	(1,180,300)	(40,000)
Repayments of other borrowings	0	(15,217)
Proceeds from subordinated debt, net	0	24,466
Proceeds from issuance of common stock, net of issuance costs	53	(208)
Net cash provided by (used in) financing activities	308,787	(165,825)
Net increase (decrease) in cash and cash equivalents	149,209	(157,761)
Cash and cash equivalents, beginning of period	343,526	668,462
Cash and cash equivalents, end of period	492,735	510,701
Supplemental disclosures of cash flow information:
Interest paid on deposits	26,034	3,670
Interest paid on borrowed funds	18,120	4,557
Cash paid for income taxes, net	30,905	10,276
Non-cash investing and financing activities:
Assets acquired from Merger with Pioneer Bancshares, Inc.	0	1,085,506
Liabilities assumed from Merger with Pioneer Bancshares, Inc.	0	1,354,387
Net change in unrealized loss on available-for-sale securities and unrealized gain on fair value hedges of securities available-for-sale	(3,736)	(54,470)
Loan charge-offs	920	2,112
Premises and equipment transferred to other real estate owned and foreclosed assets	0	338
Loans transferred to other real estate owned and foreclosed assets	4,065	291
Premises and equipment transferred (from) to other assets	(331)	64
Mortgage servicing rights resulting from sale or securitization of mortgage loans	$ 4,944	$ 8,192