Securities (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Investments in pooled trust preferred securities
Amortized Cost	$ 513,594
Fair Value	501,254	356,311
Trust preferred securities
Investments in pooled trust preferred securities
Amortized Cost	27,531	28,612
Fair Value	17,671	15,068
Available-for-sale Securities, Gross Unrealized Gain (Loss)	9,860
XIII
Investments in pooled trust preferred securities
Amortized Cost	1,141
Fair Value	1,214
Available-for-sale Securities, Gross Unrealized Gain (Loss)	(73)
Issuers Currently in Deferral or Default (percent)	30.00%
XXIII
Investments in pooled trust preferred securities
Amortized Cost	8,746
Fair Value	5,554
Available-for-sale Securities, Gross Unrealized Gain (Loss)	3,192
Issuers Currently in Deferral or Default (percent)	20.00%
XXIV
Investments in pooled trust preferred securities
Amortized Cost	12,076
Fair Value	7,381
Available-for-sale Securities, Gross Unrealized Gain (Loss)	4,695
Issuers Currently in Deferral or Default (percent)	35.00%
XXVI
Investments in pooled trust preferred securities
Amortized Cost	5,568
Fair Value	3,522
Available-for-sale Securities, Gross Unrealized Gain (Loss)	$ 2,046
Issuers Currently in Deferral or Default (percent)	31.00%