Fair Value Disclosures, Reconciliation for all Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Change in accounting	$ 14,727
Capitalized Mortgage Loan Servicing Rights [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	0	$ 0
Change in accounting	14,213
Total losses realized and unrealized [Abstract]
Included in results of operations	(264)	0
Included in other comprehensive income	0	0
Purchases, issuances, settlements, maturities and calls	778	0
Transfers in and/or out of Level 3	0	0
Ending balance	14,727	0
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	(264)	0
Capitalized Mortgage Loan Servicing Rights [Member] | 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	$ 14,213	$ 0