Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 273,747	$ 285,372	$ 285,050	$ 94,777
Impact of adopting ASC 326				38,102
Charged-off loans	(12,289)	(15,029)	(39,319)	(35,724)
Recovery of previously charged-off loans	3,008	1,973	8,673	7,128
Provision for Loan and Lease Losses	4,169	16,329	14,231	184,362
Ending Balance	268,635	288,645	268,635	288,645
Commercial real estate - Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,311	38,803	23,298	13,406
Impact of adopting ASC 326				264
Charged-off loans	(543)	(186)	(1,246)	(1,247)
Recovery of previously charged-off loans	80	47	1,158	272
Provision for Loan and Lease Losses	411	(2,238)	(3,951)	23,731
Ending Balance	19,259	36,426	19,259	36,426
Commercial real estate - Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	79,081	68,426	79,132	19,963
Impact of adopting ASC 326				(4,740)
Charged-off loans	(201)	(222)	(672)	(485)
Recovery of previously charged-off loans	326	432	486	631
Provision for Loan and Lease Losses	(5,180)	1,223	(4,920)	54,490
Ending Balance	74,026	69,859	74,026	69,859
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	30,445	29,358	33,304	8,054
Impact of adopting ASC 326				21,029
Charged-off loans	(94)	(907)	(626)	(3,033)
Recovery of previously charged-off loans	777	297	1,690	971
Provision for Loan and Lease Losses	(103)	3,201	(3,343)	4,928
Ending Balance	31,025	31,949	31,025	31,949
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	33,487	41,897	42,408	12,662
Impact of adopting ASC 326				(3,144)
Charged-off loans	0	0	(367)	0
Recovery of previously charged-off loans	32	7	269	100
Provision for Loan and Lease Losses	(659)	(682)	(9,450)	31,604
Ending Balance	32,860	41,222	32,860	41,222
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	102,101	100,610	98,423	36,112
Impact of adopting ASC 326				23,040
Charged-off loans	(10,167)	(12,984)	(32,890)	(27,982)
Recovery of previously charged-off loans	997	799	2,848	3,798
Provision for Loan and Lease Losses	8,485	13,783	33,035	67,240
Ending Balance	101,416	102,208	101,416	102,208
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,322	6,278	8,485	3,595
Impact of adopting ASC 326				2,638
Charged-off loans	(1,284)	(730)	(3,518)	(2,977)
Recovery of previously charged-off loans	796	391	2,222	1,356
Provision for Loan and Lease Losses	1,215	1,042	2,860	2,369
Ending Balance	10,049	6,981	10,049	6,981
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 writeoff of financing receivable, charged against allowance for credit loss.

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