Fair Value Disclosures, Reconciliation for all Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Capitalized Mortgage Loan Servicing Rights [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation for all assets and (liabilities) measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Beginning balance	$ 23,530	$ 14,829	$ 16,904	$ 19,171
Total losses realized and unrealized [Abstract]
Included in results of operations	(3,838)	(4,667)	(581)	(11,641)
Included in other comprehensive income (loss)	0	0	0	0
Purchases, issuances, settlements, maturities and calls	2,739	3,611	6,108	6,243
Transfers in and/or out of Level 3	0	0	0	0
Ending balance	22,431	13,773	22,431	13,773
Amount of total losses for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at June 30	$ (3,838)	$ (4,667)	$ (581)	$ (11,641)