Mortgage Servicing Rights - Summary of MSR Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Carrying amount before valuation allowance at beginning of year	$ 14,136	$ 15,595	$ 15,143
Additions – servicing obligations that result from transfers of financial assets	1,352	1,123	3,681
Amortization	(2,307)	(2,582)	(3,229)
Carrying amount before valuation allowance at end of year	13,181	14,136	15,595
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of year	(2,735)	(2,795)	(8,196)
Recovery of valuation allowance	568	60	5,401
Valuation allowance at end of year	(2,167)	(2,735)	(2,795)
Net carrying amount at end of year	$ 11,014	$ 11,401	$ 12,800