Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 1,774,541	$ 1,952,504
Federal funds sold and securities purchased under reverse repurchase agreements		50
Securities available for sale, at fair value (amortized cost: $2,327,434-2021 $1,959,773-2020; allowance for credit losses: $0)	2,337,676	1,991,815
Securities held to maturity, net of allowance for credit losses of $0 (fair value: $515,296-2021; $563,115-2020)	493,738	538,072
Paycheck Protection Program (PPP) loans	679,725	610,134
Loans held for sale (LHFS)	412,999	446,951
Loans held for investment (LHFI)	9,983,704	9,824,524
Less allowance for credit losses (ACL), LHFI	109,191	117,306
Net LHFI	9,874,513	9,707,218
Premises and equipment, net	199,098	194,278
Mortgage servicing rights	83,035	66,464
Goodwill	384,237	385,270
Identifiable intangible assets, net	6,724	7,390
Other real estate, net	10,651	11,651
Operating lease right-of-use assets	33,704	30,901
Other assets	587,672	609,142
Total Assets	16,878,313	16,551,840
Deposits:
Noninterest-bearing	4,705,991	4,349,010
Interest-bearing	9,677,449	9,699,754
Total deposits	14,383,440	14,048,764
Federal funds purchased and securities sold under repurchase agreements	160,991	164,519
Other borrowings	145,994	168,252
Subordinated notes	122,877	122,921
Junior subordinated debt securities	61,856	61,856
ACL on off-balance sheet credit exposures	29,205	38,572
Operating lease liabilities	35,389	32,290
Other liabilities	178,856	173,549
Total Liabilities	15,118,608	14,810,723
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 63,394,522 shares - 2021; 63,424,526 shares - 2020	13,209	13,215
Capital surplus	229,892	233,120
Retained earnings	1,533,110	1,495,833
Accumulated other comprehensive income (loss), net of tax	(16,506)	(1,051)
Total Shareholders' Equity	1,759,705	1,741,117
Total Liabilities and Shareholders' Equity	$ 16,878,313	$ 16,551,840