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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | $ 379,797 | $ 377,134 | $ 342,062
Mortgage servicing rights | 2,757 | 1,985 | 2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Local certificates of deposit | 514,567 | 605,585 | 589,931
Total deposits | 2,033,213 | 1,844,611 | 1,763,059
Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | 375,699 | 365,613 | 331,962
Loans | 1,599,705 | 1,460,508 | 1,421,275
Mortgage servicing rights | 2,597 | 1,956 | 1,962
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Local certificates of deposit | 238,170 | 250,264 | 253,863
National certificates of deposit | 276,397 | 355,321 | 336,068
Total deposits | 514,567 | 605,585 | 589,931
Repurchase agreements | 88,109 | 69,340 | 66,087
Federal Home Loan Bank and Federal Reserve Bank borrowings | 145,092 | 192,698 | 217,700
Total borrowed funds | 233,201 | 262,038 | 283,787
Carrying value | Commercial | Real estate |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 542,975 | 436,161 | 401,822
Carrying value | Commercial | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 72,341 | 55,803 | 51,362
Carrying value | Commercial | Other |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 284,048 | 281,057 | 305,239
Carrying value | Municipal |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 40,409 | 43,586 | 43,955
Carrying value | Residential | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 29,203 | 21,483 | 16,011
Carrying value | Residential | Term |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 534,794 | 519,101 | 494,864
Carrying value | Home equity line of credit |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 73,549 | 78,356 | 81,359
Carrying value | Consumer |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 22,386 | 24,961 | 26,663
Total Fair Value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | 379,797 | 377,134 | 342,062
Loans | 1,595,673 | 1,476,692 | 1,431,729
Mortgage servicing rights | 2,757 | 1,985 | 2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Local certificates of deposit | 239,239 | 253,892 | 255,553
National certificates of deposit | 279,653 | 359,899 | 343,022
Total deposits | 518,892 | 613,791 | 598,575
Repurchase agreements | 86,114 | 69,497 | 55,085
Federal Home Loan Bank and Federal Reserve Bank borrowings | 146,411 | 194,469 | 197,527
Total borrowed funds | 232,525 | 263,966 | 252,612
Total Fair Value | Commercial | Real estate |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 537,937 | 440,735 | 406,575
Total Fair Value | Commercial | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 71,670 | 56,388 | 51,970
Total Fair Value | Commercial | Other |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 283,585 | 279,501 | 302,600
Total Fair Value | Municipal |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 40,133 | 44,440 | 44,203
Total Fair Value | Residential | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 29,593 | 21,890 | 16,178
Total Fair Value | Residential | Term |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 540,586 | 533,059 | 505,357
Total Fair Value | Home equity line of credit |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 71,591 | 77,177 | 80,160
Total Fair Value | Consumer |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 20,578 | 23,502 | 24,686
Total Fair Value | Level 1 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | 0 | 0 | 0
Loans | 0 | 0 | 0
Mortgage servicing rights | 0 | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
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 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Commercial | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Commercial | Other |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Municipal |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Residential | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Residential | Term |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Home equity line of credit |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 1 | Consumer |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | 379,797 | 377,134 | 342,062
Loans | 224 | 794 | 789
Mortgage servicing rights | 2,757 | 1,985 | 2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Local certificates of deposit | 239,239 | 253,892 | 255,553
National certificates of deposit | 279,653 | 359,899 | 343,022
Total deposits | 518,892 | 613,791 | 598,575
Repurchase agreements | 86,114 | 69,497 | 55,085
Federal Home Loan Bank and Federal Reserve Bank borrowings | 146,411 | 194,469 | 197,527
Total borrowed funds | 232,525 | 263,966 | 252,612
Total Fair Value | Level 2 | Commercial | Real estate |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 347 | 13
Total Fair Value | Level 2 | Commercial | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Commercial | Other |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 5 | 5 | 33
Total Fair Value | Level 2 | Municipal |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Residential | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 0
Total Fair Value | Level 2 | Residential | Term |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 219 | 442 | 277
Total Fair Value | Level 2 | Home equity line of credit |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 457
Total Fair Value | Level 2 | Consumer |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 0 | 0 | 9
Total Fair Value | Level 3 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Securities to be held to maturity | 0 | 0 | 0
Loans | 1,595,449 | 1,475,898 | 1,430,940
Mortgage servicing rights | 0 | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
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 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 537,937 | 440,388 | 406,562
Total Fair Value | Level 3 | Commercial | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 71,670 | 56,388 | 51,970
Total Fair Value | Level 3 | Commercial | Other |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 283,580 | 279,496 | 302,567
Total Fair Value | Level 3 | Municipal |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 40,133 | 44,440 | 44,203
Total Fair Value | Level 3 | Residential | Construction |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 29,593 | 21,890 | 16,178
Total Fair Value | Level 3 | Residential | Term |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 540,367 | 532,617 | 505,080
Total Fair Value | Level 3 | Home equity line of credit |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | 71,591 | 77,177 | 79,703
Total Fair Value | Level 3 | Consumer |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Loans | $ 20,578 | $ 23,502 | $ 24,677

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