Goodwill, Core Deposit Premium and Other Intangible Assets (Changes in capitalized mortgage servicing rights) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period			$ 21,788	$ 15,653
Originations			5,955	10,595
Amortization			(3,778)	(5,548)
Valuation adjustment	0	0	0	496
Balance at end of period	23,965	21,196	23,965	21,196
Fair value of mortgage servicing rights	$ 33,260	$ 31,179	$ 33,260	$ 31,179	$ 32,000
Mortgage servicing rights, net to servicing portfolio			0.71%	0.73%