Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net Income (Loss)	$ 159,032	$ 192,113	$ 242,260
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	14,435	13,042	13,387
Other net amortization (accretion)	13,573	8,890	(11,001)
Provision for credit losses	17,734	(1,663)	(64,274)
Net securities (gains) losses	(900)	1,777	(1,113)
Mortgage banking income	(2,652)	(5,129)	(19,528)
Stock compensation expense	8,324	6,246	6,475
(Increase) decrease in deferred income tax assets, net	(3,681)	4,489	18,692
Increase in cash surrender value of bank-owned life insurance	(11,002)	(10,728)	(8,936)
Loans originated for sale	(299,832)	(240,270)	(648,344)
Proceeds from the sale of loans originated for sale	291,886	257,290	789,823
Net change in: accrued interest receivable and other assets	(30,029)	(63,074)	60,503
Net change in: accrued interest payable and other liabilities	12,589	44,232	(35,098)
Other—net	(155)	(3,075)	(6,549)
Net cash provided by operating activities	169,322	204,140	336,297
INVESTING ACTIVITIES
Net (increase) decrease in loans held for investment	(935,437)	(958,192)	1,108,165
Available-for-sale debt securities:
Proceeds from sales	30,987	0	0
Proceeds from maturities, prepayments and calls	341,161	604,330	839,584
Purchases of securities	(4,500)	(468,399)	(1,955,670)
Held-to-maturity debt securities:
Proceeds from maturities, prepayments and calls	46,741	88,407	108,883
Purchases of securities		(335,042)	(385,538)
Equity securities:
Purchases of bank owned life insurance			(40,000)
Proceeds from bank owned life insurance	8,330	8,726	4,615
Purchases of premises and equipment—net	(22,506)	(7,990)	(8,535)
Net cash used in investing activities	(535,224)	(1,068,160)	(328,496)
FINANCING ACTIVITIES
Increase (decrease) in deposits	38,614	(432,775)	1,140,303
Proceeds from Federal Home Loan Bank borrowings	1,605,000	650,000
Repayment of Federal Home Loan Bank borrowings	(960,000)	(128,980)	(365,201)
Decrease in other short-term borrowings	(29,176)	(6,824)	(100,057)
Principal repayments of finance lease obligations	(3,347)	(553)	(444)
Issuance of subordinated debt, net of issuance costs		147,702
Repayment of subordinated and junior subordinated debt	(2,294)		(60,000)
Dividends paid to common shareholders	(82,290)	(81,325)	(86,484)
Dividends paid to preferred shareholders	(10,125)	(10,125)	(10,125)
Treasury shares purchased—net	(3,508)	(116,047)	(179,882)
Net cash provided by financing activities	552,874	21,073	338,110
Net increase (decrease) in cash, cash equivalents and restricted cash	186,972	(842,947)	345,911
Cash, cash equivalents and restricted cash at beginning of the year	408,411	1,251,358	905,447
Cash, cash equivalents and restricted cash at end of the year	595,383	408,411	1,251,358
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	223,918	37,745	32,572
Income taxes paid	35,595	24,899	35,725
Transfers of loans to other real estate owned	$ 210	$ 1,554	$ 526