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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investment securities:    
Available-for-sale $ 268,823 $ 269,682
Common equity securities 297 291
Held-to-maturity 8,016 8,380
Loans held for sale 1,390 749
Mortgage servicing rights 730 718
Other assets 65,200 63,737
Carrying Value    
Financial assets:    
Cash and cash equivalents 51,283 32,616
Investment securities:    
Available-for-sale 268,823 269,682
Common equity securities 297 291
Held-to-maturity 7,808 8,361
Loans held for sale 1,390 749
Net loans 1,858,698 1,801,887
Accrued interest receivable 6,655 7,115
Mortgage servicing rights 730 718
Restricted equity securities 4,470 7,462
Interest rate floor 1,170 553
Interest rate swaps 6,065 108
Total assets 2,207,389 2,129,542
Financial liabilities:    
Deposits 2,001,285 1,875,022
Short-term borrowings   86,500
Long-term debt 52,509 37,906
Accrued interest payable 1,461 1,195
Interest rate swap 6,085 138
Total liabilities 2,061,340 2,000,761
Fair Value    
Financial assets:    
Cash and cash equivalents 51,283 32,616
Investment securities:    
Available-for-sale 268,823 269,682
Common equity securities 297 291
Held-to-maturity 8,016 8,380
Loans held for sale 1,390 749
Net loans 1,832,080 1,762,449
Accrued interest receivable 6,655 7,115
Mortgage servicing rights 1,739 1,710
Restricted equity securities 4,470 7,462
Interest rate floor 1,170 553
Interest rate swaps 6,065 108
Total assets 2,181,988 2,091,115
Financial liabilities:    
Deposits 2,001,911 1,874,520
Short-term borrowings   86,500
Long-term debt 52,875 38,071
Accrued interest payable 1,461 1,195
Interest rate swap 6,085 138
Total liabilities 2,062,332 2,000,424
Level 1    
Financial assets:    
Cash and cash equivalents 51,283 32,616
Investment securities:    
Available-for-sale 24,066 25,952
Common equity securities 297 291
Level 2    
Investment securities:    
Available-for-sale 244,757 244,090
Held-to-maturity 8,016 8,380
Loans held for sale 1,390 749
Accrued interest receivable 6,655 7,115
Mortgage servicing rights 1,739 1,710
Restricted equity securities 4,470 7,462
Interest rate floor 1,170 553
Interest rate swaps 6,065 108
Financial liabilities:    
Deposits 2,001,911 1,874,520
Short-term borrowings   86,500
Long-term debt 52,875 38,071
Accrued interest payable 1,461 1,195
Interest rate swap 6,085 138
Level 3    
Investment securities:    
Net loans $ 1,832,080 $ 1,762,449