Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 280,881	$ 222,465	$ 285,050	$ 94,777
Impact of adopting ASC 326				38,102
Charged-off loans	(12,755)	(9,002)	(27,029)	(20,695)
Recovery of previously charged-off loans	2,787	3,617	5,664	5,155
Provision for Loan and Lease Losses	2,834	68,292	10,062	168,033
Ending Balance	273,747	285,372	273,747	285,372
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	22,065	23,634	23,298	13,406
Impact of adopting ASC 326				264
Charged-off loans	(6)	0	(703)	(1,061)
Recovery of previously charged-off loans	476	80	1,078	225
Provision for Loan and Lease Losses	(3,224)	15,089	(4,362)	25,969
Ending Balance	19,311	38,803	19,311	38,803
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	80,519	32,114	79,132	19,963
Impact of adopting ASC 326				(4,740)
Charged-off loans	(332)	(2)	(472)	(263)
Recovery of previously charged-off loans	147	106	159	199
Provision for Loan and Lease Losses	(1,253)	36,208	262	53,267
Ending Balance	79,081	68,426	79,081	68,426
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	30,199	32,998	33,304	8,054
Impact of adopting ASC 326				21,029
Charged-off loans	(161)	(1,196)	(532)	(2,126)
Recovery of previously charged-off loans	548	484	913	674
Provision for Loan and Lease Losses	(141)	(2,928)	(3,240)	1,727
Ending Balance	30,445	29,358	30,445	29,358
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	37,642	38,911	42,408	12,662
Impact of adopting ASC 326				(3,144)
Charged-off loans	0	0	(367)	0
Recovery of previously charged-off loans	200	50	237	93
Provision for Loan and Lease Losses	(4,355)	2,936	(8,791)	32,286
Ending Balance	33,487	41,897	33,487	41,897
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	101,076	88,060	98,423	36,112
Impact of adopting ASC 326				23,040
Charged-off loans	(10,972)	(6,734)	(22,721)	(14,998)
Recovery of previously charged-off loans	645	2,249	1,851	2,997
Provision for Loan and Lease Losses	11,352	17,035	24,548	53,459
Ending Balance	102,101	100,610	102,101	100,610
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,380	6,748	8,485	3,595
Impact of adopting ASC 326				2,638
Charged-off loans	(1,284)	(1,070)	(2,234)	(2,247)
Recovery of previously charged-off loans	771	648	1,426	967
Provision for Loan and Lease Losses	455	(48)	1,645	1,325
Ending Balance	9,322	6,278	9,322	6,278
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	0	0	985
Impact of adopting ASC 326				(985)
Charged-off loans	0	0	0	0
Recovery of previously charged-off loans	0	0	0	0
Provision for Loan and Lease Losses	0	0	0	0
Ending Balance	$ 0	$ 0	$ 0	$ 0

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 (decrease) in allowance for credit loss on financing receivable.

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

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