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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investment securities:    
Available-for-sale $ 270,384 $ 269,682
Common equity securities 292 291
Held-to-maturity 8,310 8,380
Loans held for sale   749
Mortgage servicing rights 709 718
Other assets 68,144 63,737
Carrying Value    
Financial assets:    
Cash and cash equivalents 26,052 32,616
Investment securities:    
Available-for-sale 270,384 269,682
Common equity securities 292 291
Held-to-maturity 8,162 8,361
Loans held for sale   749
Net loans 1,827,497 1,801,887
Accrued interest receivable 7,211 7,115
Mortgage servicing rights 709 718
Restricted equity securities 8,426 7,462
Interest rate floor 597 553
Interest rate swaps 1,328 108
Total assets 2,150,658 2,129,542
Financial liabilities:    
Deposits 1,868,230 1,875,022
Short-term borrowings 109,000 86,500
Long-term debt 37,446 37,906
Accrued interest payable 878 1,195
Interest rate swap 1,468 138
Total liabilities 2,017,022 2,000,761
Fair Value    
Financial assets:    
Cash and cash equivalents 26,052 32,616
Investment securities:    
Available-for-sale 270,384 269,682
Common equity securities 292 291
Held-to-maturity 8,310 8,380
Loans held for sale   749
Net loans 1,793,934 1,762,449
Accrued interest receivable 7,211 7,115
Mortgage servicing rights 1,689 1,710
Restricted equity securities 8,426 7,462
Interest rate floor 597 553
Interest rate swaps 1,328 108
Total assets 2,118,223 2,091,115
Financial liabilities:    
Deposits 1,865,940 1,874,520
Short-term borrowings 109,000 86,500
Long-term debt 37,696 38,071
Accrued interest payable 878 1,195
Interest rate swap 1,468 138
Total liabilities 2,014,982 2,000,424
Level 1    
Financial assets:    
Cash and cash equivalents 26,052 32,616
Investment securities:    
Available-for-sale 23,757 25,952
Common equity securities 292 291
Level 2    
Investment securities:    
Available-for-sale 246,627 244,090
Held-to-maturity 8,310 8,380
Loans held for sale   749
Accrued interest receivable 7,211 7,115
Mortgage servicing rights 1,689 1,710
Restricted equity securities 8,426 7,462
Interest rate floor 597 553
Interest rate swaps 1,328 108
Financial liabilities:    
Deposits 1,865,940 1,874,520
Short-term borrowings 109,000 86,500
Long-term debt 37,696 38,071
Accrued interest payable 878 1,195
Interest rate swap 1,468 138
Level 3    
Investment securities:    
Net loans $ 1,793,934 $ 1,762,449