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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
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