Commitments and Contingencies Narrative Data (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Unpaid principal balance of loans serviced for others	$ 579,900	$ 534,200
Credit Enhancement Obligation [Member]
Loss Contingencies [Line Items]
Contractual risk sharing commitments, maximum liability	705	702
Reserve for contingent contractual liability, amount accrued	18	$ 18
Federal Home Loan Bank MPF Program [Member]
Loss Contingencies [Line Items]
Total loans sold through the MPF program since inceptions into the program	30,800
Unpaid principal balance of loans serviced for others	$ 13,000