Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Cash and due from banks	$ 22,230	$ 23,687
Federal funds sold and overnight interest-bearing deposits	6,636	18,396
Certificates of deposit in other banks	12,745	12,247
Available for sale securities	213,181	218,205
Mortgage servicing rights	2,657	2,931
Accrued interest receivable	6,146	6,162
Deposits:
Non-interest bearing demand	261,868	262,857
Savings, interest checking and money market	596,237	614,040
Operating lease liabilities	2,345
Accrued interest payable	1,306	1,035
Carrying Amount
Assets:
Cash and due from banks	22,230	23,687
Federal funds sold and overnight interest-bearing deposits	6,636	18,396
Certificates of deposit in other banks	12,745	12,247
Available for sale securities	213,181	218,205
Other investment securities	5,333	5,675
Loans, net	1,145,060	1,134,975
Mortgage servicing rights	2,657	2,931
Cash surrender value - life insurance	2,579	2,542
Accrued interest receivable	6,146	6,162
Assets, Total	1,416,567	1,424,820
Deposits:
Non-interest bearing demand	261,868	262,857
Savings, interest checking and money market	596,237	614,040
Time deposits	328,004	321,571
Federal funds purchased and securities sold under agreements to repurchase	25,334	24,647
Operating lease liabilities	2,345
Federal Home Loan Bank advances and other borrowings	85,038	95,153
Subordinated notes	49,486	49,486
Accrued interest payable	1,306	1,035
Liabilities, Total	1,349,618	1,368,789
Total Fair Value
Assets:
Cash and due from banks	22,230	23,687
Federal funds sold and overnight interest-bearing deposits	6,636	18,396
Certificates of deposit in other banks	12,745	12,247
Available for sale securities	213,181	218,205
Other investment securities	5,333	5,675
Loans, net	1,124,440	1,115,003
Mortgage servicing rights	2,657	2,931
Cash surrender value - life insurance	2,579	2,542
Accrued interest receivable	6,146	6,162
Assets, Total	1,395,947	1,404,848
Deposits:
Non-interest bearing demand	261,868	262,857
Savings, interest checking and money market	596,237	614,040
Time deposits	327,733	318,949
Federal funds purchased and securities sold under agreements to repurchase	25,334	24,647
Operating lease liabilities	2,345
Federal Home Loan Bank advances and other borrowings	85,806	94,326
Subordinated notes	43,393	45,749
Accrued interest payable	1,306	1,035
Liabilities, Total	1,344,022	1,361,603
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and due from banks	22,230	23,687
Federal funds sold and overnight interest-bearing deposits	6,636	18,396
Certificates of deposit in other banks	12,745	12,247
Available for sale securities	2,690	1,952
Other investment securities	13	12
Loans, net	0	0
Mortgage servicing rights	0	0
Cash surrender value - life insurance	0	0
Accrued interest receivable	6,146	6,162
Assets, Total	50,460	62,456
Deposits:
Non-interest bearing demand	261,868	262,857
Savings, interest checking and money market	596,237	614,040
Time deposits	0	0
Federal funds purchased and securities sold under agreements to repurchase	25,334	24,647
Operating lease liabilities	0
Federal Home Loan Bank advances and other borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	1,306	1,035
Liabilities, Total	884,745	902,579
Other Observable Inputs (Level 2)
Assets:
Cash and due from banks	0	0
Federal funds sold and overnight interest-bearing deposits	0	0
Certificates of deposit in other banks	0	0
Available for sale securities	210,491	216,253
Other investment securities	5,320	5,663
Loans, net	0	0
Mortgage servicing rights	0	0
Cash surrender value - life insurance	2,579	2,542
Accrued interest receivable	0	0
Assets, Total	218,390	224,458
Deposits:
Non-interest bearing demand	0	0
Savings, interest checking and money market	0	0
Time deposits	0	0
Federal funds purchased and securities sold under agreements to repurchase	0	0
Operating lease liabilities	2,345
Federal Home Loan Bank advances and other borrowings	85,806	94,326
Subordinated notes	43,393	45,749
Accrued interest payable	0	0
Liabilities, Total	131,544	140,075
Significant Unobservable Inputs (Level 3)
Assets:
Cash and due from banks	0	0
Federal funds sold and overnight interest-bearing deposits	0	0
Certificates of deposit in other banks	0	0
Available for sale securities	0	0
Other investment securities	0	0
Loans, net	1,124,440	1,115,003
Mortgage servicing rights	2,657	2,931
Cash surrender value - life insurance	0	0
Accrued interest receivable	0	0
Assets, Total	1,127,097	1,117,934
Deposits:
Non-interest bearing demand	0	0
Savings, interest checking and money market	0	0
Time deposits	327,733	318,949
Federal funds purchased and securities sold under agreements to repurchase	0	0
Operating lease liabilities	0
Federal Home Loan Bank advances and other borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Liabilities, Total	$ 327,733	$ 318,949