Fair Value Measurements - Schedule Of Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Purchased receivables, net	$ 22,231	$ 20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Derivative liability	77	149
Level 1 inputs
Financial assets:
Mortgage servicing rights	0	0
Financial liabilities:
Derivative liability	0	0
Level 1 inputs | Carrying Amount
Financial assets:
Cash, due from banks and deposits in other banks	77,841	50,551
Investment securities	59,117	43,486
Level 1 inputs | Fair Value
Financial assets:
Cash, due from banks and deposits in other banks	77,841	50,551
Investment securities	59,117	43,486
Level 2 inputs
Financial assets:
Mortgage servicing rights	0	0
Financial liabilities:
Derivative liability	77	149
Level 2 inputs | Carrying Amount
Financial assets:
Investment securities	253,633	288,632
Investment in Federal Home Loan Bank Stock	2,115	1,965
Accrued interest receivable	4,385	3,734
Financial liabilities:
Deposits	1,258,283	1,267,653
Securities sold under repurchase agreements	27,746	27,607
Borrowings	7,362	4,338
Accrued interest payable	24	64
Level 2 inputs | Fair Value
Financial assets:
Investment securities	253,633	288,655
Investment in Federal Home Loan Bank Stock	2,115	1,965
Accrued interest receivable	4,385	3,734
Financial liabilities:
Deposits	1,257,670	1,266,995
Securities sold under repurchase agreements	27,746	27,607
Borrowings	7,308	4,186
Accrued interest payable	24	64
Level 3 inputs
Financial assets:
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Derivative liability	0	0
Level 3 inputs | Carrying Amount
Financial assets:
Loans and loans held for sale	999,445	1,018,611
Purchased receivables, net	22,231	20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Accrued liability, RML acquisition payments	0	186
Junior subordinated debentures	10,310	18,558
Level 3 inputs | Fair Value
Financial assets:
Loans and loans held for sale	1,001,346	1,026,350
Purchased receivables, net	22,231	20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Accrued liability, RML acquisition payments	0	186
Junior subordinated debentures	9,856	18,398
Interest rate swaps
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 1 inputs
Financial assets:
Derivative asset	0	0
Financial liabilities:
Derivative liability	0	0
Interest rate swaps | Level 2 inputs
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 2 inputs | Carrying Amount
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 2 inputs | Fair Value
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 3 inputs
Financial assets:
Derivative asset	0	0
Financial liabilities:
Derivative liability	0	0
Interest rate lock commitments
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 1 inputs
Financial assets:
Derivative asset	0	0
Interest rate lock commitments | Level 2 inputs
Financial assets:
Derivative asset	0	0
Interest rate lock commitments | Level 3 inputs
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 3 inputs | Carrying Amount
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 3 inputs | Fair Value
Financial assets:
Derivative asset	873	1,137
Retail interest rate contracts
Financial liabilities:
Derivative liability		78
Retail interest rate contracts | Level 1 inputs
Financial liabilities:
Derivative liability		0
Retail interest rate contracts | Level 2 inputs
Financial liabilities:
Derivative liability		78
Retail interest rate contracts | Level 2 inputs | Carrying Amount
Financial liabilities:
Derivative liability	0	78
Retail interest rate contracts | Level 2 inputs | Fair Value
Financial liabilities:
Derivative liability	$ 0	78
Retail interest rate contracts | Level 3 inputs
Financial liabilities:
Derivative liability		$ 0