Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 285,050	$ 94,777
Impact of adopting ASC 326		38,102
Charged-off loans	(14,274)	(11,693)
Recovery of previously charged-off loans	2,877	1,538
Provision for Loan and Lease Losses	7,228	99,741
Ending Balance	280,881	222,465
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	23,298	13,406
Impact of adopting ASC 326		264
Charged-off loans	(697)	(1,561)
Recovery of previously charged-off loans	602	145
Provision for Loan and Lease Losses	(1,138)	11,380
Ending Balance	22,065	23,634
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	79,132	19,963
Impact of adopting ASC 326		(4,740)
Charged-off loans	(140)	(261)
Recovery of previously charged-off loans	12	93
Provision for Loan and Lease Losses	1,515	17,059
Ending Balance	80,519	32,114
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	33,304	8,054
Impact of adopting ASC 326		21,029
Charged-off loans	(371)	(930)
Recovery of previously charged-off loans	365	190
Provision for Loan and Lease Losses	(3,099)	4,655
Ending Balance	30,199	32,998
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	42,408	12,662
Impact of adopting ASC 326		(3,144)
Charged-off loans	(367)	0
Recovery of previously charged-off loans	37	43
Provision for Loan and Lease Losses	(4,436)	29,350
Ending Balance	37,642	38,911
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	98,423	36,112
Impact of adopting ASC 326		23,040
Charged-off loans	(11,749)	(7,734)
Recovery of previously charged-off loans	1,206	748
Provision for Loan and Lease Losses	13,196	35,894
Ending Balance	101,076	88,060
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,485	3,595
Impact of adopting ASC 326		2,638
Charged-off loans	(950)	(1,207)
Recovery of previously charged-off loans	655	319
Provision for Loan and Lease Losses	1,190	1,403
Ending Balance	9,380	6,748
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	985
Impact of adopting ASC 326		(985)
Charged-off loans	0	0
Recovery of previously charged-off loans	0	0
Provision for Loan and Lease Losses	0	0
Ending Balance	$ 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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