Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income	$ 192,113	$ 242,260	$ 122,044
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	13,042	13,387	14,131
Other net amortization (accretion)	8,890	(11,001)	(9,890)
Provision for credit losses	(1,663)	(64,274)	107,741
Net securities losses (gains)	1,777	(1,113)	(4,268)
Mortgage banking income	(5,129)	(19,528)	(22,736)
Stock compensation expense	6,246	6,475	5,653
(Increase) decrease in deferred income tax assets, net	4,489	18,692	(10,518)
Increase in cash surrender value of bank-owned life insurance	(10,728)	(8,936)	(7,359)
Loans originated for sale	(240,270)	(648,344)	(910,155)
Proceeds from the sale of loans originated for sale	257,290	789,823	786,352
Net change in: accrued interest receivable and other assets	(63,074)	60,503	(30,280)
Net change in: accrued interest payable and other liabilities	44,232	(35,098)	16,189
Other—net	(3,075)	(6,549)	2,702
Net cash provided by operating activities	204,140	336,297	59,606
INVESTING ACTIVITIES
Net (increase) decrease in loans held for investment	(958,192)	1,108,165	(538,688)
Available-for-sale debt securities:
Proceeds from sales			226,099
Proceeds from maturities, prepayments and calls	604,330	839,584	803,006
Purchases of securities	(468,399)	(1,955,670)	(585,930)
Held-to-maturity debt securities:
Proceeds from maturities, prepayments and calls	88,407	108,883	200,100
Purchases of securities	(335,042)	(385,538)	(82,695)
Equity securities:
Proceeds from sales			203
Purchases of bank owned life insurance		(40,000)
Proceeds from bank owned life insurance	8,726	4,615	832
Purchases of premises and equipment—net	(7,990)	(8,535)	(7,551)
Sale of portfolio loans			42,416
Net cash (used in) provided by investing activities	(1,068,160)	(328,496)	57,792
FINANCING ACTIVITIES
(Decrease) increase in deposits	(432,775)	1,140,303	1,435,497
Proceeds from Federal Home Loan Bank borrowings	650,000		475,000
Repayment of Federal Home Loan Bank borrowings	(128,980)	(365,201)	(1,341,814)
Decrease in other short-term borrowings	(6,824)	(100,057)	(32,912)
Principal repayments of finance lease obligations	(553)	(444)	(422)
Decrease in federal funds purchased			(7,500)
Issuance of subordinated debt, net of issuance costs	147,702
Repayment of subordinated debt and junior subordinated debt		(60,000)	(6,702)
Dividends paid to common shareholders	(81,325)	(86,484)	(85,253)
Dividends paid to preferred shareholders	(10,125)	(10,125)	(2,644)
Issuance of common stock			59
Issuance of preferred stock, net of issuance costs			144,484
Treasury shares purchased—net	(116,047)	(179,882)	(24,540)
Net cash provided by financing activities	21,073	338,110	553,253
Net (decrease) increase in cash, cash equivalents and restricted cash	(842,947)	345,911	670,651
Cash, cash equivalents and restricted cash at beginning of the year	1,251,358	905,447	234,796
Cash, cash equivalents and restricted cash at end of the year	408,411	1,251,358	905,447
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	37,745	32,572	75,082
Income taxes paid	24,899	35,725	36,975
Transfers of loans to other real estate owned	$ 1,554	$ 526	263
Transfers of portfolio loans to loans held for sale			$ 42,416