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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 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 | $ 341,962 | $ 281,606 | $ 302,527
Securities to be held to maturity | 352,225 | 287,045 | 308,075
Mortgage servicing rights | 1,777 | 2,089 | 2,087
Total deposits | 1,740,121 | 1,650,466 | 1,592,956
Carrying value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | 341,962 | 281,606 | 302,527
Loans | 1,437,513 | 1,285,436 | 1,237,661
Mortgage servicing rights, carrying value | 1,874 | 1,546 | 1,368
Local certificates of deposit | 269,054 | 285,602 | 281,903
National certificates of deposit | 387,579 | 404,377 | 435,095
Total deposits | 656,633 | 689,979 | 716,998
Repurchase agreements | 61,103 | 37,450 | 40,954
Federal Home Loan Bank and Federal Reserve Bank borrowings | 217,702 | 147,505 | 140,904
Total borrowed funds | 278,805 | 184,955 | 181,858
Carrying value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 392,296 | 368,645 | 355,285
Carrying value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 46,605 | 37,678 | 32,417
Carrying value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 323,994 | 215,068 | 202,004
Carrying value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 49,526 | 41,258 | 36,083
Carrying value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 14,638 | 14,785 | 13,212
Carrying value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 497,258 | 491,315 | 480,032
Carrying value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 85,636 | 91,149 | 94,009
Carrying value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 27,560 | 25,538 | 24,619
Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 352,225 | 287,045 | 308,075
Loans | 1,436,079 | 1,275,685 | 1,223,815
Mortgage servicing rights | 1,777 | 2,089 | 2,087
Local certificates of deposit | 272,305 | 281,480 | 283,746
National certificates of deposit | 429,110 | 412,337 | 436,682
Total deposits | 701,415 | 693,817 | 720,428
Repurchase agreements | 61,399 | 37,450 | 40,912
Federal Home Loan Bank and Federal Reserve Bank borrowings | 218,644 | 140,063 | 139,880
Total borrowed funds | 280,043 | 177,513 | 180,792
Total Fair Value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 389,956 | 364,626 | 350,390
Total Fair Value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 46,327 | 37,366 | 31,970
Total Fair Value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 321,575 | 212,548 | 200,804
Total Fair Value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 48,791 | 40,552 | 35,825
Total Fair Value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 14,709 | 14,786 | 13,089
Total Fair Value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 503,574 | 491,359 | 475,560
Total Fair Value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 85,635 | 90,959 | 93,260
Total Fair Value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 25,512 | 23,489 | 22,917
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 | 352,225 | 287,045 | 308,075
Loans | 753 | 6,579 | 6,693
Mortgage servicing rights | 1,777 | 2,089 | 2,087
Local certificates of deposit | 272,305 | 281,480 | 283,746
National certificates of deposit | 429,110 | 412,337 | 436,682
Total deposits | 701,415 | 693,817 | 720,428
Repurchase agreements | 61,399 | 37,450 | 40,912
Federal Home Loan Bank and Federal Reserve Bank borrowings | 218,644 | 140,063 | 139,880
Total borrowed funds | 280,043 | 177,513 | 180,792
Total Fair Value | Level 2 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 12 | 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 | 8 | 5,046 | 5,315
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 | 163 | 577 | 745
Total Fair Value | Level 2 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 570 | 954 | 11
Total Fair Value | Level 2 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 0 | 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 | 1,435,326 | 1,269,106 | 1,217,122
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 | 389,944 | 364,624 | 349,768
Total Fair Value | Level 3 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 46,327 | 37,366 | 31,970
Total Fair Value | Level 3 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 321,567 | 207,502 | 195,489
Total Fair Value | Level 3 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 48,791 | 40,552 | 35,825
Total Fair Value | Level 3 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 14,709 | 14,786 | 13,089
Total Fair Value | Level 3 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 503,411 | 490,782 | 474,815
Total Fair Value | Level 3 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 85,065 | 90,005 | 93,249
Total Fair Value | Level 3 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | $ 25,512 | $ 23,489 | $ 22,917

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