Goodwill, Core Deposit Premium and Other Intangible Assets (Changes in capitalized mortgage and commercial servicing rights) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]
Valuation allowance on commercial servicing rights	$ (46)	$ 0	$ (46)	$ 0
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period			30,314	24,984
Originations			5,799	7,015
Amortization			(4,826)	(4,360)
Balance at end of period	31,287	27,639	31,287	27,639
Fair value of servicing rights	39,881	36,971	$ 39,881	$ 36,971	$ 40,900
Servicing rights, net to servicing portfolio (as a percent)			0.74%	0.73%
Commercial servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period			$ 4,611	$ 0
Purchased commercial servicing rights			190	4,255
Originations			404	141
Amortization			(792)	(452)
Valuation allowance on commercial servicing rights			(46)	0
Balance at end of period	4,367	3,944	4,367	3,944
Fair value of servicing rights	$ 4,791	$ 4,429	$ 4,791	$ 4,429
Servicing rights, net to servicing portfolio (as a percent)			2.44%	2.87%