Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 1,917,564	$ 2,266,829
Securities available for sale, at fair value (amortized cost: $3,191,329 - 2022 $3,256,289 - 2021; allowance for credit losses (ACL): $0)	3,018,246	3,238,877
Securities held to maturity, net of ACL of $0 (fair value: $594,204 - 2022; $353,511 - 2021)	607,598	342,537
Paycheck Protection Program (PPP) loans	18,579	33,336
Loans held for sale (LHFS)	222,538	275,706
Loans held for investment (LHFI)	10,397,129	10,247,829
Less ACL, LHFI	98,734	99,457
Net LHFI	10,298,395	10,148,372
Premises and equipment, net	207,301	205,644
Mortgage servicing rights (MSR)	111,050	87,687
Goodwill	384,237	384,237
Identifiable intangible assets, net	4,591	5,074
Other real estate, net	3,187	4,557
Operating lease right-of-use assets	34,048	34,603
Other assets	614,217	568,177
Total Assets	17,441,551	17,595,636
Deposits:
Noninterest-bearing	4,739,102	4,771,065
Interest-bearing	10,374,190	10,316,095
Total deposits	15,113,292	15,087,160
Federal funds purchased and securities sold under repurchase agreements	170,499	238,577
Other borrowings	84,644	91,025
Subordinated notes	123,097	123,042
Junior subordinated debt securities	61,856	61,856
ACL on off-balance sheet credit exposures	34,517	35,623
Operating lease liabilities	35,912	36,468
Other liabilities	186,352	180,574
Total Liabilities	15,810,169	15,854,325
Shareholders' Equity
Common stock, no par value:Authorized: 250,000,000 shares Issued and outstanding: 61,463,392 shares - 2022; 61,648,679 shares - 2021	12,806	12,845
Capital surplus	167,094	175,913
Retained earnings	1,600,138	1,585,113
Accumulated other comprehensive income (loss), net of tax	(148,656)	(32,560)
Total Shareholders' Equity	1,631,382	1,741,311
Total Liabilities and Shareholders' Equity	$ 17,441,551	$ 17,595,636