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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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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 | $ 302,527,000 | $ 255,663,000 | $ 260,077,000
Securities to be held to maturity | 308,075,000 | 250,900,000 | 256,316,000
Mortgage servicing rights | 2,087,000 | 2,586,000 | 2,581,000
Total certificates of deposits | 1,592,956,000 | 1,527,085,000 | 1,416,646,000
Carrying value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | 302,527,000 | 255,663,000 | 260,077,000
Loans | 1,237,661,000 | 1,227,051,000 | 1,212,968,000
Mortgage servicing rights, carrying value | 1,368,000 | 1,354,000 | 1,285,000
Local certificates of deposit | 281,903,000 | 284,482,000 | 267,932,000
National certificates of deposit | 435,095,000 | 306,927,000 | 389,459,000
Total certificates of deposits | 716,998,000 | 591,409,000 | 657,391,000
Repurchase agreements | 40,954,000 | 40,205,000 | 91,764,000
Federal Home Loan Bank advances | 140,904,000 | 170,112,000 | 205,691,000
Total borrowed funds | 181,858,000 | 210,317,000 | 297,455,000
Carrying value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 355,285,000 | 349,243,000 | 345,853,000
Carrying value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 32,417,000 | 27,018,000 | 39,852,000
Carrying value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 202,004,000 | 192,420,000 | 180,750,000
Carrying value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 36,083,000 | 51,101,000 | 48,693,000
Carrying value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 13,212,000 | 17,705,000 | 14,550,000
Carrying value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 480,032,000 | 467,760,000 | 452,289,000
Carrying value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 94,009,000 | 97,650,000 | 106,892,000
Carrying value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 24,619,000 | 24,154,000 | 24,089,000
Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 308,075,000 | 250,900,000 | 256,316,000
Loans | 1,223,815,000 | 1,193,788,000 | 1,188,573,000
Mortgage servicing rights | 2,087,000 | 2,586,000 | 2,581,000
Local certificates of deposit | 283,746,000 | 281,282,000 | 263,342,000
National certificates of deposit | 436,682,000 | 307,508,000 | 389,062,000
Total certificates of deposits | 720,428,000 | 588,790,000 | 652,404,000
Repurchase agreements | 40,912,000 | 40,161,000 | 88,560,000
Federal Home Loan Bank advances | 139,880,000 | 169,240,000 | 204,476,000
Total borrowed funds | 180,792,000 | 209,401,000 | 293,036,000
Total Fair Value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 350,390,000 | 340,526,000 | 338,784,000
Total Fair Value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 31,970,000 | 26,344,000 | 39,037,000
Total Fair Value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 200,804,000 | 189,842,000 | 178,904,000
Total Fair Value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 35,825,000 | 50,965,000 | 47,790,000
Total Fair Value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 13,089,000 | 17,083,000 | 14,443,000
Total Fair Value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 475,560,000 | 451,323,000 | 441,029,000
Total Fair Value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 93,260,000 | 95,175,000 | 105,264,000
Total Fair Value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 22,917,000 | 22,530,000 | 23,322,000
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 certificates of deposits | 0 | 0 | 0
Repurchase agreements | 0 | 0 | 0
Federal Home Loan Bank advances | 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 | 308,075,000 | 250,900,000 | 256,316,000
Loans | 6,693,000 | 7,415,000 | 6,387,000
Mortgage servicing rights | 2,087,000 | 2,586,000 | 2,581,000
Local certificates of deposit | 283,746,000 | 281,282,000 | 263,342,000
National certificates of deposit | 436,682,000 | 307,508,000 | 389,062,000
Total certificates of deposits | 720,428,000 | 588,790,000 | 652,404,000
Repurchase agreements | 40,912,000 | 40,161,000 | 88,560,000
Federal Home Loan Bank advances | 139,880,000 | 169,240,000 | 204,476,000
Total borrowed funds | 180,792,000 | 209,401,000 | 293,036,000
Total Fair Value | Level 2 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 622,000 | 423,000 | 423,000
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 | 5,315,000 | 6,096,000 | 5,527,000
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 | 745,000 | 793,000 | 339,000
Total Fair Value | Level 2 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 11,000 | 103,000 | 98,000
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 | 1,217,122,000 | 1,186,373,000 | 1,182,186,000
Mortgage servicing rights | 0 | 0 | 0
Local certificates of deposit | 0 | 0 | 0
National certificates of deposit | 0 | 0 | 0
Total certificates of deposits | 0 | 0 | 0
Repurchase agreements | 0 | 0 | 0
Federal Home Loan Bank advances | 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 | 349,768,000 | 340,103,000 | 338,361,000
Total Fair Value | Level 3 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 31,970,000 | 26,344,000 | 39,037,000
Total Fair Value | Level 3 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 195,489,000 | 183,746,000 | 173,377,000
Total Fair Value | Level 3 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 35,825,000 | 50,965,000 | 47,790,000
Total Fair Value | Level 3 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 13,089,000 | 17,083,000 | 14,443,000
Total Fair Value | Level 3 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 474,815,000 | 450,530,000 | 440,690,000
Total Fair Value | Level 3 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 93,249,000 | 95,072,000 | 105,166,000
Total Fair Value | Level 3 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | $ 22,917,000 | $ 22,530,000 | $ 23,322,000

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