Allowance for Credit Losses - Activity in 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	$ 86,643	$ 85,411	$ 92,733	$ 35,154
Initial Allowance on PCD Loans Acquired During the Period				516
Provision for Credit Losses	(4,855)	7,611	(10,570)	37,124
Charge- Offs	(1,784)	(2,495)	(2,725)	(4,141)
Recoveries	1,129	744	1,700	1,417
TDR Allowance Adjustments	(6)	(21)	(11)	(46)
Ending Balance	81,127	91,250	81,127	91,250
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,428	4,646	4,920	1,842
Initial Allowance on PCD Loans Acquired During the Period				48
Provision for Credit Losses	(469)	2,478	(979)	3,727
Charge- Offs	0	0	0	0
Recoveries	96	37	114	66
TDR Allowance Adjustments	(2)	0	(2)	(1)
Ending Balance	4,053	7,161	4,053	7,161
Commercial real estate - owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,792	5,327	9,868	5,361
Initial Allowance on PCD Loans Acquired During the Period				207
Provision for Credit Losses	(1,116)	229	(1,192)	(34)
Charge- Offs	0	0	0	(45)
Recoveries	0	18	0	18
TDR Allowance Adjustments	0	(12)	0	(25)
Ending Balance	8,676	5,562	8,676	5,562
Commercial real estate - non owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	36,229	35,643	38,266	7,863
Initial Allowance on PCD Loans Acquired During the Period				140
Provision for Credit Losses	(1,423)	3,345	(3,461)	21,628
Charge- Offs	0	0	0	(12)
Recoveries	1	4	2	32
TDR Allowance Adjustments	0	0	0	0
Ending Balance	34,807	38,992	34,807	38,992
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	14,353	19,899	17,500	7,667
Initial Allowance on PCD Loans Acquired During the Period				97
Provision for Credit Losses	(2,407)	574	(5,779)	6,834
Charge- Offs	(21)	(113)	(21)	(131)
Recoveries	621	101	850	218
TDR Allowance Adjustments	(3)	(8)	(7)	(19)
Ending Balance	12,543	20,453	12,543	20,453
Commercial and financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	18,916	15,470	18,690	9,716
Initial Allowance on PCD Loans Acquired During the Period				11
Provision for Credit Losses	399	1,319	1,174	4,063
Charge- Offs	(1,564)	(1,768)	(2,320)	(2,866)
Recoveries	265	493	472	913
TDR Allowance Adjustments	0	0	0	0
Ending Balance	18,016	15,514	18,016	15,514
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,925	4,426	3,489	2,705
Initial Allowance on PCD Loans Acquired During the Period				13
Provision for Credit Losses	161	(334)	(333)	906
Charge- Offs	(199)	(614)	(384)	(1,087)
Recoveries	146	91	262	170
TDR Allowance Adjustments	(1)	(1)	(2)	(1)
Ending Balance	3,032	3,568	3,032	3,568
Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	0	0	0
Initial Allowance on PCD Loans Acquired During the Period				0
Provision for Credit Losses	0	0	0	0
Charge- Offs	0	0	0	0
Recoveries	0	0	0	0
TDR Allowance Adjustments	0	0	0	0
Ending Balance	$ 0	$ 0	$ 0	0
Impact of Adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				21,226
Impact of Adoption of ASC 326 | Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				1,479
Impact of Adoption of ASC 326 | Commercial real estate - owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				80
Impact of Adoption of ASC 326 | Commercial real estate - non owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				9,341
Impact of Adoption of ASC 326 | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				5,787
Impact of Adoption of ASC 326 | Commercial and financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				3,677
Impact of Adoption of ASC 326 | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				862
Impact of Adoption of ASC 326 | Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				$ 0