Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 item	Dec. 31, 2012 item
Investment Securities Available-for-Sale, Total temporary impaired securities
Less than 12 months, Number	178	3
Less than 12 months, Fair Value	$ 202,228	$ 15,420
Less than 12 months, Gross Unrealized Holding Losses	(4,925)	(153)
12 months or more, Number	1	31
12 months or more, Fair Value	12,607	1,012
12 months or more, Gross Unrealized Holding Losses	(913)	(330)
Total, Number	179	34
Total, Fair Value	214,835	16,432
Total, Gross Unrealized Holding Losses	(5,838)	(483)
Municipal bonds
Investment Securities Available-for-Sale, Total temporary impaired securities
Less than 12 months, Number	133	1
Less than 12 months, Fair Value	61,524	292
Less than 12 months, Gross Unrealized Holding Losses	(1,850)	(1)
Total, Number	133	1
Total, Fair Value	61,524	292
Total, Gross Unrealized Holding Losses	(1,850)	(1)
Mortgage-backed securities
Investment Securities Available-for-Sale, Total temporary impaired securities
Less than 12 months, Number	45	2
Less than 12 months, Fair Value	140,704	15,128
Less than 12 months, Gross Unrealized Holding Losses	(3,075)	(152)
12 months or more, Number	1	31
12 months or more, Fair Value	12,607	1,012
12 months or more, Gross Unrealized Holding Losses	(913)	(330)
Total, Number	46	33
Total, Fair Value	153,311	16,140
Total, Gross Unrealized Holding Losses	$ (3,988)	$ (482)