Investment Securities Available-for-Sale Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2015 USD ($) securities	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	$ 125,526	$ 53,701
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(1,106)	(311)
Continuous unrealized loss position, 12 months or longer, fair value	48,644	80,130
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	(1,625)	(2,530)
Total, continuous unrealized loss position, fair value	174,170	133,831
Total, continuous unrealized loss position, gross unrealized losses	(2,731)	(2,841)
U.S. government agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	0	10,039
Continuous unrealized loss position, less than 12 months, gross unrealized losses	0	(10)
Continuous unrealized loss position, 12 months or longer, fair value	0	0
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	0	0
Total, continuous unrealized loss position, fair value	0	10,039
Total, continuous unrealized loss position, gross unrealized losses	$ 0	(10)
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	21
Continuous unrealized loss position, less than 12 months, fair value	$ 321	6,614
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(1)	(90)
Continuous unrealized loss position, 12 months or longer, fair value	2,053	5,887
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	(20)	(71)
Total, continuous unrealized loss position, fair value	2,374	12,501
Total, continuous unrealized loss position, gross unrealized losses	$ (21)	(161)
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	11
Continuous unrealized loss position, less than 12 months, fair value	$ 53,043	17,283
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(449)	(87)
Continuous unrealized loss position, 12 months or longer, fair value	38,286	53,318
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	(841)	(1,329)
Total, continuous unrealized loss position, fair value	91,329	70,601
Total, continuous unrealized loss position, gross unrealized losses	$ (1,290)	(1,416)
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	2
Continuous unrealized loss position, less than 12 months, fair value	$ 67,662	15,184
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(600)	(101)
Continuous unrealized loss position, 12 months or longer, fair value	7,200	17,126
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	(96)	(183)
Total, continuous unrealized loss position, fair value	74,862	32,310
Total, continuous unrealized loss position, gross unrealized losses	$ (696)	(284)
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	1
Continuous unrealized loss position, less than 12 months, fair value	$ 0	0
Continuous unrealized loss position, less than 12 months, gross unrealized losses	0	0
Continuous unrealized loss position, 12 months or longer, fair value	1,105	918
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	(668)	(845)
Total, continuous unrealized loss position, fair value	1,105	918
Total, continuous unrealized loss position, gross unrealized losses	(668)	(845)
Corporate notes and equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	4,500	4,581
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(56)	(23)
Continuous unrealized loss position, 12 months or longer, fair value	0	2,881
Continuous unrealized loss position, 12 months or longer, gross unrealized losses	0	(102)
Total, continuous unrealized loss position, fair value	4,500	7,462
Total, continuous unrealized loss position, gross unrealized losses	$ (56)	$ (125)