Income Taxes Schedule of deferred income tax asset and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 12,120	$ 10,818
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	7,091	7,888
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	0	5,347
Deferred Tax Assets, Hedging Transactions	121	0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	3,131	2,896
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	964	1,028
Deferred tax asset, deferred loan fees	1,451	1,221
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	477	556
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,132	1,567
Deferred Tax Assets, Property, Plant and Equipment	0	206
Deferred Tax Assets, Operating Loss Carryforwards	4,094	4,663
Deferred Tax Assets, Other	843	824
Deferred Tax Assets, Gross	35,521	37,014
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	4,662	0
Deferred Tax Liabilities, Property, Plant and Equipment	585	0
Deferred Tax Liabilities, Investments	6,231	6,120
Deferred Tax Liabilities, Prepaid Expenses	19,238	19,133
Deferred Tax Liabilities, Mortgage Servicing Rights	2,153	2,137
Deferred Tax Liabilities, Partnership Adjustments	178	630
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost	49	769
Deferred Tax Liabilities, Operating lease right of use asset	2,932	0
Deferred Tax Liabilities, Leasing Arrangements	2,697	0
Deferred Tax Liabilities, Other	488	210
Deferred Tax Liabilities, Tax Deferred Income	39,213	28,999
Net deferred tax asset (liability)	3,692
Deferred Tax Assets, Net		8,015
Deferred Tax Assets, Operating lease liability	$ 3,097	$ 0