Fair Value Measurements - Fair Value, Financial Instruments, Unobservable Input Reconciliation (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Securities available for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$ 3,051	$ 3,039	$ 3,040	$ 3,049
Total (losses) gains:
Included in other comprehensive income	3	3	14	(7)
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Transfer in and/or out of Level 3	0	0	0	0
Ending balance	3,054	3,042	3,054	3,042
Change in unrealized (losses) gains relating to assets still held at the reporting date	3	3	14	(7)
State tax credits held for sale
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	14,985	19,822	16,491	23,020
Total (losses) gains:
Included in earnings	146	317	407	422
Purchases, sales, issuances and settlements:
Sales	0	0	(1,767)	(3,303)
Ending balance	15,131	20,139	15,131	20,139
Change in unrealized (losses) gains relating to assets still held at the reporting date	$ 146	$ 317	$ (58)	$ (456)