Fair Value Disclosures, Reconciliation for all Assets and Liabilities 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
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Beginning balance	$ 15,699	$ 0
Change in accounting	0	14,213
Total gains (losses) realized and unrealized [Abstract]
Included in results of operations	1,029	(264)
Included in other comprehensive income (loss)	0	0
Purchases, issuances, settlements, maturities and calls	1,055	778
Transfers in and/or out of Level 3	0	0
Ending balance	17,783	14,727
Amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31	1,029	(264)
As Adjusted [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Beginning balance	$ 15,699	$ 14,213