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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | $ 341,592 | $ 281,606 | $ 281,219
Securities to be held to maturity | 349,248 | 287,045 | 282,568
Mortgage servicing rights | 2,126 | 2,089 | 2,410
Total deposits | 1,644,612 | 1,650,466 | 1,606,875
Carrying value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity, carrying value | 341,592 | 281,606 | 281,219
Loans | 1,332,350 | 1,285,436 | 1,253,149
Mortgage servicing rights, carrying value | 1,609 | 1,546 | 1,356
Local certificates of deposit | 290,440 | 285,602 | 293,980
National certificates of deposit | 420,498 | 404,377 | 418,496
Total deposits | 710,938 | 689,979 | 712,476
Repurchase agreements | 37,937 | 37,450 | 30,309
Federal Home Loan Bank advances | 210,103 | 147,505 | 140,110
Total borrowed funds | 248,040 | 184,955 | 170,419
Carrying value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 378,049 | 368,645 | 353,521
Carrying value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 43,397 | 37,678 | 33,852
Carrying value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 234,940 | 215,068 | 201,459
Carrying value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 43,502 | 41,258 | 54,217
Carrying value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 15,163 | 14,785 | 18,415
Carrying value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 499,478 | 491,315 | 472,941
Carrying value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 89,442 | 91,149 | 94,957
Carrying value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 28,379 | 25,538 | 23,787
Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities to be held to maturity | 349,248 | 287,045 | 282,568
Loans | 1,324,671 | 1,275,685 | 1,229,685
Mortgage servicing rights | 2,126 | 2,089 | 2,410
Local certificates of deposit | 290,886 | 281,480 | 293,325
National certificates of deposit | 429,110 | 412,337 | 419,285
Total deposits | 719,996 | 693,817 | 712,610
Repurchase agreements | 37,494 | 37,450 | 30,276
Federal Home Loan Bank advances | 211,228 | 140,063 | 139,565
Total borrowed funds | 248,722 | 177,513 | 169,841
Total Fair Value | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 371,916 | 364,626 | 347,398
Total Fair Value | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 42,693 | 37,366 | 33,266
Total Fair Value | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 233,411 | 212,548 | 199,700
Total Fair Value | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 41,909 | 40,552 | 53,179
Total Fair Value | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 15,304 | 14,786 | 18,034
Total Fair Value | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 503,098 | 491,359 | 463,150
Total Fair Value | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 89,407 | 90,959 | 92,834
Total Fair Value | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 26,933 | 23,489 | 22,124
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 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 | 349,248 | 287,045 | 282,568
Loans | 1,051 | 6,579 | 6,519
Mortgage servicing rights | 2,126 | 2,089 | 2,410
Local certificates of deposit | 290,886 | 281,480 | 293,325
National certificates of deposit | 429,110 | 412,337 | 419,285
Total deposits | 719,996 | 693,817 | 712,610
Repurchase agreements | 37,494 | 37,450 | 30,276
Federal Home Loan Bank advances | 211,228 | 140,063 | 139,565
Total borrowed funds | 248,722 | 177,513 | 169,841
Total Fair Value | Level 2 | Commercial | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 7 | 2 | 422
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 | 0 | 5,046 | 5,458
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 | 335 | 577 | 625
Total Fair Value | Level 2 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 700 | 954 | 14
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 | 1,323,620 | 1,269,106 | 1,223,166
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 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 | 371,909 | 364,624 | 346,976
Total Fair Value | Level 3 | Commercial | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 42,693 | 37,366 | 33,266
Total Fair Value | Level 3 | Commercial | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 233,411 | 207,502 | 194,242
Total Fair Value | Level 3 | Municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 41,909 | 40,552 | 53,179
Total Fair Value | Level 3 | Residential | Construction |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 15,304 | 14,786 | 18,034
Total Fair Value | Level 3 | Residential | Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 502,763 | 490,782 | 462,525
Total Fair Value | Level 3 | Home equity line of credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | 88,707 | 90,005 | 92,820
Total Fair Value | Level 3 | Consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans | $ 26,924 | $ 23,489 | $ 22,124

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