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Accounting Policies, New Accounting Standards (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Standards [Abstract] |  |  |  |  |  |
Other liabilities | $ 33,694 |  | $ 29,332 |  |  |
Equity, net of tax | 654,865 |  | 614,886 |  | $ 564,150 | $ 530,699
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount | $ 48,022 | [1] | $ 35,096 | [1] | $ 35,908 |
% of portfolio |  |  | 1.08% |  |  |
Reserve for unfunded lending commitments |  |  | $ 274 |  |  |
Commercial Loans [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 21,683 |  |  |
% of portfolio |  |  | 1.30% |  |  |
Real Estate Mortgage [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 5,501 |  |  |
% of portfolio |  |  | 0.61% |  |  |
Consumer Direct [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 1,711 |  |  |
% of portfolio |  |  | 1.16% |  |  |
Consumer Indirect [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 6,201 |  |  |
% of portfolio |  |  | 1.18% |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |
New Accounting Standards [Abstract] |  |  |  |  |  |
Forecast period used in calculating the allowance for credit losses | 12 months |  |  |  |  |
Effect of adoption of ASU in allowance for credit losses | $ 3,000 |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 38,137 |  |  |
% of portfolio |  |  | 1.17% |  |  |
Reserve for unfunded lending commitments |  |  | $ 386 |  |  |
ASU 2016-13 [Member] | Commercial Loans [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 21,680 |  |  |
% of portfolio |  |  | 1.30% |  |  |
ASU 2016-13 [Member] | Real Estate Mortgage [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 7,319 |  |  |
% of portfolio |  |  | 0.81% |  |  |
ASU 2016-13 [Member] | Consumer Direct [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 1,671 |  |  |
% of portfolio |  |  | 1.13% |  |  |
ASU 2016-13 [Member] | Consumer Indirect [Member] |  |  |  |  |  |
Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] |  |  |  |  |  |
Amount |  |  | $ 7,467 |  |  |
% of portfolio |  |  | 1.42% |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
New Accounting Standards [Abstract] |  |  |  |  |  |
Other liabilities |  |  | $ 112 |  |  |
Equity, net of tax |  |  | (2,366) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Unfunded Commitment [Member] |  |  |  |  |  |
New Accounting Standards [Abstract] |  |  |  |  |  |
Other liabilities |  |  | 112 |  |  |
Equity, net of tax |  |  | $ 84 |  |  |
[1] | Effective January 1, 2020, the allowance for loan and lease losses became the allowance for credit losses with the implementation of ASU 2016-13, commonly referred to as CECL.

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