Income Taxes Schedule of deferred income tax asset and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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