Fair Value Measurements - Fair Value, Financial Instruments, Unobservable Input Reconciliation (Details) (Recurring basis, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Securities available for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$ 3,049,000	$ 6,763,000
Total gains (losses):
Included in other comprehensive income	(9,000)	22,000
Purchases, sales, issuances and settlements:
Purchases	0	0
Transfer in and/or out of Level 3	0	(3,736,000)
Ending Balance	3,040,000	3,049,000
Change in unrealized gains relating to assets still held at the reporting date	(9,000)	22,000
State tax credits held for sale
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	23,020,000	26,350,000
Total gains (losses):
Included in earnings	564,000	1,192,000
Purchases, sales, issuances and settlements:
Sales	(7,093,000)	(4,522,000)
Ending Balance	16,491,000	23,020,000
Change in unrealized gains relating to assets still held at the reporting date	$ (1,317,000)	$ 80,000