Other Real Estate Owned (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
OREO activity
Balance, beginning of year	$ 38,092,000	$ 79,303,000
Additions	15,822,000	26,276,000
Sales	(28,219,000)	(59,053,000)
Valuation adjustments	(2,199,000)	(8,434,000)
Balance, end of year	23,496,000	38,092,000
OREO Valuation Allowances	7,400,000	17,400,000
Non-Covered OREO
OREO activity
Balance, beginning of year	12,611,000	21,027,000
Additions	6,768,000	3,283,000
Sales	(8,523,000)	(10,280,000)
Valuation adjustments	(120,000)	(1,419,000)
Balance, end of year	10,736,000	12,611,000
Covered OREO
OREO activity
Balance, beginning of year	25,481,000	58,276,000
Additions	9,054,000	22,993,000
Sales	(19,696,000)	(48,773,000)
Valuation adjustments	(2,079,000)	(7,015,000)
Balance, end of year	$ 12,760,000	$ 25,481,000
FDIC reimbursement (as a percent)	80.00%
Payable to FDIC (as a percent)	80.00%