Fair Value of Assets and Liabilities - Schedule Of Estimated Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 1,410	$ 1,208
Purchased receivables, net	19,835	20,491
Mortgage servicing rights	5,828	4,157
Derivative liabilities	73	149
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commitments to extend credit	241,578	236,624
Standby letters of credit	9,316	9,931
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commitments to extend credit	2,416	2,366
Standby letters of credit	93	99
Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	0	0
Derivative liabilities	0	0
Level 1 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, due from banks and deposits in other banks	25,793	50,551
Investment securities	61,612	43,486
Level 1 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, due from banks and deposits in other banks	25,793	50,551
Investment securities	61,612	43,486
Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	0	0
Derivative liabilities	73	149
Level 2 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	236,508	288,632
Investment in Federal Home Loan Bank stock	1,993	1,965
Accrued interest receivable	3,763	3,734
Deposits	1,234,310	1,267,653
Securities sold under repurchase agreements	24,392	27,607
Borrowings	4,314	4,338
Accrued interest payable	133	64
Level 2 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	236,515	288,655
Investment in Federal Home Loan Bank stock	1,993	1,965
Accrued interest receivable	3,763	3,734
Deposits	1,233,786	1,266,995
Securities sold under repurchase agreements	24,392	27,607
Borrowings	4,322	4,186
Accrued interest payable	133	64
Level 3 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	5,828	4,157
Derivative liabilities	0	0
Level 3 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and loans held for sale	1,045,072	1,018,661
Purchased receivables, net	19,835	20,491
Mortgage servicing rights	5,828	4,157
Accrued liability, RML acquisition payments	360	186
Junior subordinated debentures	18,558	18,558
Level 3 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and loans held for sale	1,055,592	1,026,350
Purchased receivables, net	19,835	20,491
Mortgage servicing rights	5,828	4,157
Accrued liability, RML acquisition payments	360	186
Junior subordinated debentures	19,156	18,398
Commercial interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	73	71
Derivative liabilities	73	71
Commercial interest rate swaps | Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Commercial interest rate swaps | Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	73	71
Derivative liabilities	73	71
Commercial interest rate swaps | Level 2 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	73	71
Derivative liabilities	73	71
Commercial interest rate swaps | Level 2 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	73	71
Derivative liabilities	73	71
Commercial interest rate swaps | Level 3 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Interest rate lock commitments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,337	1,137
Interest rate lock commitments | Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Interest rate lock commitments | Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Interest rate lock commitments | Level 3 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,337	1,137
Interest rate lock commitments | Level 3 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,337	1,137
Interest rate lock commitments | Level 3 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,337	1,137
Retail interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		78
Retail interest rate contracts | Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		0
Retail interest rate contracts | Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		78
Retail interest rate contracts | Level 2 inputs | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	78
Retail interest rate contracts | Level 2 inputs | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	$ 0	78
Retail interest rate contracts | Level 3 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		$ 0