Fair Value Measurements Carrying Amounts and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Carrying value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 30,922	$ 77,693
Federal funds sold	1,547	318,742
Securities available for sale, at fair value	763,397	420,571
Federal Home Loan Bank stock	11,544	11,723
Loans, net	2,331,469	2,251,139
Accrued interest receivable	11,772	11,231
Derivative asset, interest rate swaps	3,295	492
Deposits	2,736,923	2,700,994
Federal funds purchased	39,380	5,375
Subordinated notes, net	20,462	20,452
Federal Home Loan Bank advances	125,000	175,000
Long-term debt	17,654	21,558
Accrued interest payable	503	939
Derivative liability, interest rate swaps	14,169	24,340
Carrying value [Member] | Commitments to extend credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Carrying value [Member] | Standby letters of credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	30,922	77,693
Federal funds sold	1,547	318,742
Federal Home Loan Bank stock	11,544	11,723
Accrued interest receivable	11,772	11,231
Federal funds purchased	39,380	5,375
Accrued interest payable	503	939
Approximate fair value [Member] | Fair value, inputs, level 1 [Member] | Commitments to extend credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 1 [Member] | Standby letters of credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale, at fair value	763,397	420,571
Loans, net	2,380,549	2,316,867
Derivative asset, interest rate swaps	3,295	492
Deposits	2,737,307	2,701,833
Subordinated notes, net	16,743	17,349
Federal Home Loan Bank advances	125,000	175,000
Long-term debt	17,654	21,556
Derivative liability, interest rate swaps	14,169	24,340
Approximate fair value [Member] | Fair value, inputs, level 2 [Member] | Commitments to extend credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 2 [Member] | Standby letters of credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	6,225	12,817
Approximate fair value [Member] | Fair value, inputs, level 3 [Member] | Commitments to extend credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Approximate fair value [Member] | Fair value, inputs, level 3 [Member] | Standby letters of credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure, off-balance sheet risks, Face Amount, Liability	0	0
Cash and due from banks	30,922	77,693
Federal funds sold	1,547	318,742
Securities available for sale, at fair value	763,397	420,571
Federal Home Loan Bank stock	11,544	11,723
Loans, net	2,331,469	2,251,139
Accrued interest receivable	11,772	11,231
Deposits	2,736,923	2,700,994
Federal funds purchased	39,380	5,375
Federal Home Loan Bank advances	$ 125,000	$ 175,000