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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 272,483	$ 273,747	$ 263,233	$ 285,050
Charged-off loans	(17,699)	(12,289)	(33,384)	(39,319)
Recovery of previously charged-off loans	6,716	3,008	18,566	8,673
Provision for Loan and Lease Losses	26,588	4,169	39,673	14,231
Ending Balance	288,088	268,635	288,088	268,635
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,609	19,311	19,618	23,298
Charged-off loans	(447)	(543)	(1,412)	(1,246)
Recovery of previously charged-off loans	1,039	80	1,373	1,158
Provision for Loan and Lease Losses	(132)	411	490	(3,951)
Ending Balance	20,069	19,259	20,069	19,259
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	52,547	79,081	58,504	79,132
Charged-off loans	(99)	(201)	(284)	(672)
Recovery of previously charged-off loans	0	326	247	486
Provision for Loan and Lease Losses	(1,884)	(5,180)	(7,903)	(4,920)
Ending Balance	50,564	74,026	50,564	74,026
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	33,883	30,445	32,104	33,304
Charged-off loans	(155)	(94)	(409)	(626)
Recovery of previously charged-off loans	426	777	1,298	1,690
Provision for Loan and Lease Losses	1,311	(103)	2,472	(3,343)
Ending Balance	35,465	31,025	35,465	31,025
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	28,681	33,487	29,429	42,408
Charged-off loans	0	0	(150)	(367)
Recovery of previously charged-off loans	15	32	164	269
Provision for Loan and Lease Losses	(75)	(659)	(822)	(9,450)
Ending Balance	28,621	32,860	28,621	32,860
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	125,772	102,101	112,340	98,423
Charged-off loans	(13,029)	(10,167)	(22,684)	(32,890)
Recovery of previously charged-off loans	2,869	997	10,393	2,848
Provision for Loan and Lease Losses	24,673	8,485	40,236	33,035
Ending Balance	140,285	101,416	140,285	101,416
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,991	9,322	11,238	8,485
Charged-off loans	(3,969)	(1,284)	(8,445)	(3,518)
Recovery of previously charged-off loans	2,367	796	5,091	2,222
Provision for Loan and Lease Losses	2,695	1,215	5,200	2,860
Ending Balance	$ 13,084	$ 10,049	$ 13,084	$ 10,049

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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