Mortgage Servicing Rights (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Servicing Asset [Abstract]
Carrying amount before valuation allowance at beginning of year	$ 15,595	$ 15,143	$ 15,401
Additions – servicing obligations that result from transfers of financial assets	1,123	3,681	3,651
Amortization	(2,582)	(3,229)	(3,909)
Carrying amount before valuation allowance at end of year	14,136	15,595	15,143
Valuation allowance at beginning of year	(2,795)	(8,196)	(7,265)
Recovery of (provision for) valuation allowance	60	5,401	(931)
Valuation allowance at end of year	(2,735)	(2,795)	(8,196)
Net carrying amount at end of year	$ 11,401	$ 12,800	$ 6,947