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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | $ 331,962 | $ 281,606 | $ 298,786
Securities to be held to maturity | 342,062 | 287,045 | 306,647
Amortized Cost | 2,220 | 1,546 | 1,451
Mortgage servicing rights | 2,013 | 2,089 | 2,083
Total deposits | 1,763,059 | 1,650,466 | 1,623,290
Carrying value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | 331,962 | 281,606 | 298,786
Loans | 1,421,275 | 1,285,436 | 1,251,694
Amortized Cost | 2,220 | 1,546 | 1,451
Local certificates of deposit | 253,863 | 285,602 | 283,119
National certificates of deposit | 336,068 | 404,377 | 378,654
Total deposits | 589,931 | 689,979 | 661,773
Repurchase agreements | 66,087 | 37,450 | 41,310
Federal Home Loan Bank and Federal Reserve Bank borrowings | 217,700 | 147,505 | 140,107
Total borrowed funds | 283,787 | 184,955 | 181,417
Carrying value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 401,822 | 368,645 | 363,725
Carrying value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 51,362 | 37,678 | 36,829
Carrying value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 305,239 | 215,068 | 198,093
Carrying value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 43,955 | 41,258 | 36,492
Carrying value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 16,011 | 14,785 | 14,091
Carrying value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 494,864 | 491,315 | 484,160
Carrying value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 81,359 | 91,149 | 93,180
Carrying value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 26,663 | 25,538 | 25,124
Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 342,062 | 287,045 | 306,647
Loans | 1,431,729 | 1,275,685 | 1,239,145
Mortgage servicing rights | 2,013 | 2,089 | 2,083
Local certificates of deposit | 255,553 | 281,480 | 285,598
National certificates of deposit | 343,022 | 412,337 | 379,995
Total deposits | 598,575 | 693,817 | 665,593
Repurchase agreements | 55,085 | 37,450 | 40,004
Federal Home Loan Bank and Federal Reserve Bank borrowings | 197,527 | 140,063 | 140,008
Total borrowed funds | 252,612 | 177,513 | 180,012
Total Fair Value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 406,575 | 364,626 | 360,061
Total Fair Value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 51,970 | 37,366 | 36,458
Total Fair Value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 302,600 | 212,548 | 196,674
Total Fair Value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 44,203 | 40,552 | 36,192
Total Fair Value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 16,178 | 14,786 | 14,032
Total Fair Value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 505,357 | 491,359 | 482,121
Total Fair Value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 80,160 | 90,959 | 90,289
Total Fair Value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 24,686 | 23,489 | 23,318
Total Fair Value | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 0 | 0 | 0
Loans | 0 | 0 | 0
Mortgage servicing rights | 0 | 0 | 0
Local certificates of deposit | 0 | 0 | 0
National certificates of deposit | 0 | 0 | 0
Total deposits | 0 | 0 | 0
Repurchase agreements | 0 | 0 | 0
Federal Home Loan Bank and Federal Reserve Bank borrowings | 0 | 0 | 0
Total borrowed funds | 0 | 0 | 0
Total Fair Value | Level 1 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 342,062 | 287,045 | 306,647
Loans | 789 | 6,579 | 7,143
Mortgage servicing rights | 2,013 | 2,089 | 2,083
Local certificates of deposit | 255,553 | 281,480 | 285,598
National certificates of deposit | 343,022 | 412,337 | 379,995
Total deposits | 598,575 | 693,817 | 665,593
Repurchase agreements | 55,085 | 37,450 | 40,004
Federal Home Loan Bank and Federal Reserve Bank borrowings | 197,527 | 140,063 | 140,008
Total borrowed funds | 252,612 | 177,513 | 180,012
Total Fair Value | Level 2 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 13 | 2 | 622
Total Fair Value | Level 2 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 33 | 5,046 | 5,142
Total Fair Value | Level 2 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 277 | 577 | 992
Total Fair Value | Level 2 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 457 | 954 | 387
Total Fair Value | Level 2 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 9 | 0 | 0
Total Fair Value | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 0 | 0 | 0
Loans | 1,430,940 | 1,269,106 | 1,232,002
Mortgage servicing rights | 0 | 0 | 0
Local certificates of deposit | 0 | 0 | 0
National certificates of deposit | 0 | 0 | 0
Total deposits | 0 | 0 | 0
Repurchase agreements | 0 | 0 | 0
Federal Home Loan Bank and Federal Reserve Bank borrowings | 0 | 0 | 0
Total borrowed funds | 0 | 0 | 0
Total Fair Value | Level 3 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 406,562 | 364,624 | 359,439
Total Fair Value | Level 3 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 51,970 | 37,366 | 36,458
Total Fair Value | Level 3 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 302,567 | 207,502 | 191,532
Total Fair Value | Level 3 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 44,203 | 40,552 | 36,192
Total Fair Value | Level 3 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 16,178 | 14,786 | 14,032
Total Fair Value | Level 3 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 505,080 | 490,782 | 481,129
Total Fair Value | Level 3 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 79,703 | 90,005 | 89,902
Total Fair Value | Level 3 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | $ 24,677 | $ 23,489 | $ 23,318

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