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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
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	$ 14,515		$ 14,515
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	14,727	$ 0	0	$ 0
Change in accounting					$ 0	$ 14,213	$ 0	$ 0
Total losses realized and unrealized [Abstract]
Included in results of operations	(1,231)	0	(1,495)	0
Included in other comprehensive income	0	0	0	0
Purchases, issuances, settlements, maturities and calls	1,019	0	1,797	0
Transfers in and/or out of Level 3	0	0	0	0
Ending balance	14,515	0	14,515	0
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	(1,231)	0	(1,495)	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	$ 14,727	$ 0	$ 14,213	$ 0