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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 263,233	$ 285,050
Charged-off loans	(6,512)	(14,274)
Recovery of previously charged-off loans	3,554	2,877
Provision for Loan and Lease Losses	1,343	7,228
Ending Balance	261,618	280,881
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,618	23,298
Charged-off loans	(86)	(697)
Recovery of previously charged-off loans	127	602
Provision for Loan and Lease Losses	(154)	(1,138)
Ending Balance	19,505	22,065
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	58,504	79,132
Charged-off loans	0	(140)
Recovery of previously charged-off loans	63	12
Provision for Loan and Lease Losses	(2,489)	1,515
Ending Balance	56,078	80,519
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	32,104	33,304
Charged-off loans	(162)	(371)
Recovery of previously charged-off loans	294	365
Provision for Loan and Lease Losses	84	(3,099)
Ending Balance	32,320	30,199
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	29,429	42,408
Charged-off loans	0	(367)
Recovery of previously charged-off loans	74	37
Provision for Loan and Lease Losses	320	(4,436)
Ending Balance	29,823	37,642
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	112,340	98,423
Charged-off loans	(4,380)	(11,749)
Recovery of previously charged-off loans	1,924	1,206
Provision for Loan and Lease Losses	2,528	13,196
Ending Balance	112,412	101,076
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,238	8,485
Charged-off loans	(1,884)	(950)
Recovery of previously charged-off loans	1,072	655
Provision for Loan and Lease Losses	1,054	1,190
Ending Balance	$ 11,480	$ 9,380

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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