Loans and Allowance for Credit Losses - Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 12,493	$ 11,120
Nonaccrual With No ACL	8,212	10,723
Government guarantees
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,017	1,483
Nonaccrual With No ACL	1,017	1,483
Net of government guarantees
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	11,476	9,637
Nonaccrual With No ACL	7,195	9,240
Commercial & industrial loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	4,974	3,848
Nonaccrual With No ACL	1,179	3,513
Commercial real estate | Owner occupied properties
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	3,640	4,620
Nonaccrual With No ACL	3,640	4,582
Residential | 1-4 family residential properties secured by first liens
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,950	160
Nonaccrual With No ACL	1,464	160
Residential | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	275	242
Nonaccrual With No ACL	275	221
Residential | 1-4 family residential construction loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	109	702
Nonaccrual With No ACL	109	702
Other construction, land development and raw land loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,545	1,545
Nonaccrual With No ACL	1,545	1,545
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0	3
Nonaccrual With No ACL	$ 0	$ 0