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Loans, Allowance for Credit Losses, and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
PPP loans approved and funded	$ 66,900		$ 240,500
Unamortized net deferred loan fees	3,389	$ 5,439	3,698
Unamortized discount on loans acquired	4,800
Payments that exceeded carrying amount of PCI loans		446
Loan discount accretion income		352
Additional loan interest income		80
Recovery		14
Interest income on restructured loans			1,100
Loans, gross	4,873,230	4,819,175	4,735,013
Allowance for loan losses	63,628	$ 49,226	52,388	$ 65,022	$ 42,342	$ 21,398
Special Mention Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	40,700		61,260
Classified
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 53,300
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans	90.00%
Hotel | Minimum
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans	10.00%
Hotel | Maximum
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans	25.00%
Non Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans	75.00%
Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement	$ 1,900		1,900
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses	11,074		582
PCI Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross			8,591
PCI Loans | Purchased Credit Impaired Loans
Loans and Leases Receivable Disclosure [Line Items]
Carrying value of PCI loans			8,600
PCI Loans | Special Mention Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross			85
SBA PPP loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized net deferred loan fees	4,300		6,000
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Remaining unaccreted discount	$ 6,600		7,300
Purchased Non-Impaired Loans
Loans and Leases Receivable Disclosure [Line Items]
Remaining unaccreted discount			$ 7,900

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