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Income Taxes Schedule of deferred income tax asset and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Components of Deferred Tax Assets [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses | $ 19,512 | $ 12,120
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 9,150 | 7,091
Deferred Tax Assets, Hedging Transactions | 186 | 121
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 3,887 | 3,131
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses | 1,012 | 964
Deferred tax asset, deferred loan fees | 3,283 | 1,451
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 571 | 477
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 2,567 | 2,132
Deferred Tax Assets, Operating Loss Carryforwards | 3,629 | 4,094
Deferred Tax Assets, Operating lease liability | 3,561 | 3,097
Deferred Tax Assets, Other | 1,424 | 843
Deferred Tax Assets, Gross | 48,782 | 35,521
Components of Deferred Tax Liabilities [Abstract] |  |
Deferred Tax Liabilities, Unrealized Gains on Trading Securities | 10,507 | 4,662
Deferred Tax Liabilities, Property, Plant and Equipment | 3,360 | 585
Deferred Tax Liabilities, Investments | 6,637 | 6,231
Deferred Tax Liabilities, Prepaid Expenses | 20,407 | 19,238
Deferred Tax Liabilities, Mortgage Servicing Rights | 2,781 | 2,153
Deferred Tax Liabilities, Partnership Adjustments | 204 | 178
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost | 604 | 49
Deferred Tax Liabilities, Operating lease right of use asset | 3,343 | 2,932
Deferred Tax Liabilities, Leasing Arrangements | 3,433 | 2,697
Deferred Tax Liabilities, Other | 398 | 488
Deferred Tax Liabilities, Tax Deferred Income | 51,674 | 39,213
Net deferred tax liability | $ 2,892 | $ 3,692

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