Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 261,618	$ 280,881	$ 263,233	$ 285,050
Charged-off loans	(9,173)	(12,755)	(15,685)	(27,029)
Recovery of previously charged-off loans	8,296	2,787	11,850	5,664
Provision for Loan and Lease Losses	11,742	2,834	13,085	10,062
Ending Balance	272,483	273,747	272,483	273,747
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,505	22,065	19,618	23,298
Charged-off loans	(879)	(6)	(965)	(703)
Recovery of previously charged-off loans	207	476	334	1,078
Provision for Loan and Lease Losses	776	(3,224)	622	(4,362)
Ending Balance	19,609	19,311	19,609	19,311
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	56,078	80,519	58,504	79,132
Charged-off loans	(185)	(332)	(185)	(472)
Recovery of previously charged-off loans	184	147	247	159
Provision for Loan and Lease Losses	(3,530)	(1,253)	(6,019)	262
Ending Balance	52,547	79,081	52,547	79,081
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	32,320	30,199	32,104	33,304
Charged-off loans	(92)	(161)	(254)	(532)
Recovery of previously charged-off loans	578	548	872	913
Provision for Loan and Lease Losses	1,077	(141)	1,161	(3,240)
Ending Balance	33,883	30,445	33,883	30,445
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	29,823	37,642	29,429	42,408
Charged-off loans	(150)	0	(150)	(367)
Recovery of previously charged-off loans	75	200	149	237
Provision for Loan and Lease Losses	(1,067)	(4,355)	(747)	(8,791)
Ending Balance	28,681	33,487	28,681	33,487
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	112,412	101,076	112,340	98,423
Charged-off loans	(5,275)	(10,972)	(9,655)	(22,721)
Recovery of previously charged-off loans	5,600	645	7,524	1,851
Provision for Loan and Lease Losses	13,035	11,352	15,563	24,548
Ending Balance	125,772	102,101	125,772	102,101
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,480	9,380	11,238	8,485
Charged-off loans	(2,592)	(1,284)	(4,476)	(2,234)
Recovery of previously charged-off loans	1,652	771	2,724	1,426
Provision for Loan and Lease Losses	1,451	455	2,505	1,645
Ending Balance	$ 11,991	$ 9,322	$ 11,991	$ 9,322

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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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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