Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 83,315	$ 92,733
Initial Allowance on PCD Loans Acquired During the Period	51
Provision for Credit Losses	6,556	(5,715)
Charge- Offs	(665)	(941)
Recoveries	586	571
TDR Allowance Adjustments	(5)	(5)
Ending Balance	89,838	86,643
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,751	4,920
Initial Allowance on PCD Loans Acquired During the Period	0
Provision for Credit Losses	(493)	(510)
Charge- Offs	0	0
Recoveries	10	18
TDR Allowance Adjustments	0	0
Ending Balance	2,268	4,428
Commercial real estate - owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,579	9,868
Initial Allowance on PCD Loans Acquired During the Period	0
Provision for Credit Losses	715	(76)
Charge- Offs	0	0
Recoveries	0	0
TDR Allowance Adjustments	0	0
Ending Balance	9,294	9,792
Commercial real estate - non owner-occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	36,617	38,266
Initial Allowance on PCD Loans Acquired During the Period	31
Provision for Credit Losses	7,274	(2,038)
Charge- Offs	0	0
Recoveries	0	1
TDR Allowance Adjustments	0	0
Ending Balance	43,922	36,229
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	12,811	17,500
Initial Allowance on PCD Loans Acquired During the Period	17
Provision for Credit Losses	1,060	(3,372)
Charge- Offs	(1)	0
Recoveries	191	229
TDR Allowance Adjustments	(3)	(4)
Ending Balance	14,075	14,353
Commercial and financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,744	18,690
Initial Allowance on PCD Loans Acquired During the Period	3
Provision for Credit Losses	(1,628)	775
Charge- Offs	(569)	(756)
Recoveries	177	207
TDR Allowance Adjustments	0	0
Ending Balance	17,727	18,916
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,813	3,489
Initial Allowance on PCD Loans Acquired During the Period	0
Provision for Credit Losses	(372)	(494)
Charge- Offs	(95)	(185)
Recoveries	208	116
TDR Allowance Adjustments	(2)	(1)
Ending Balance	2,552	2,925
Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	0
Initial Allowance on PCD Loans Acquired During the Period	0
Provision for Credit Losses	0	0
Charge- Offs	0	0
Recoveries	0	0
TDR Allowance Adjustments	0	0
Ending Balance	$ 0	$ 0