Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Amortized cost:
Servicing Asset at Fair Value, Amount	$ 45,300	$ 46,000
Mortgage
Amortized cost:
Balance at beginning of year	42,148	42,452
Originations of mortgage servicing rights	6,166	5,047
Amortization expense	(7,370)	(5,351)
Balance at end of year	40,944	$ 42,148
Amortization [Abstract]
2016	10,681
2017	9,292
2018	7,774
2019	6,118
20120	$ 4,316