Non-Covered Loans and Allowance for Non-Covered Loan Losses (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Covered PCI loans
Days outstanding loans and leases receivable are generally considered past due	90 days
Noncovered
Covered PCI loans
Unpaid Contractual Principal balance	$ 217,492,000		$ 111,615,000
Recorded Investment with No Allowance	107,211,000		31,247,000
Recorded Investment with Allowance	28,996,000		32,563,000
Total Recorded Investment	136,207,000		63,810,000
Related Allowance	5,391,000		5,740,000
Non-accrual loans	25,061,000		19,042,000
Interest income recorded on accruing impaired loans	600,000	1,400,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	100,011,000	92,896,000
Noncovered | Secured
Covered PCI loans
Unpaid Contractual Principal balance	75,888,000		51,036,000
Recorded Investment with No Allowance	29,554,000		14,096,000
Recorded Investment with Allowance	9,934,000		11,783,000
Total Recorded Investment	39,488,000		25,879,000
Related Allowance	3,081,000		3,341,000
Non-accrual loans	23,141,000		16,488,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	32,684,000	33,997,000
Noncovered | Unsecured
Covered PCI loans
Unpaid Contractual Principal balance	3,727,000		4,120,000
Recorded Investment with No Allowance			92,000
Recorded Investment with Allowance			68,000
Total Recorded Investment			160,000
Non-accrual loans	81,000		160,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	80,000	1,335,000
Noncovered | Secured by commercial properties
Covered PCI loans
Unpaid Contractual Principal balance	88,406,000		29,865,000
Recorded Investment with No Allowance	48,941,000		7,243,000
Recorded Investment with Allowance	14,306,000		15,536,000
Total Recorded Investment	63,247,000		22,779,000
Related Allowance	2,039,000		1,878,000
Non-accrual loans	420,000		438,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	43,013,000	32,874,000
Noncovered | Secured by residential properties
Covered PCI loans
Unpaid Contractual Principal balance	27,651,000		4,701,000
Recorded Investment with No Allowance	20,233,000		1,583,000
Recorded Investment with Allowance	1,203,000		1,390,000
Total Recorded Investment	21,436,000		2,973,000
Related Allowance	92,000		85,000
Non-accrual loans	693,000		1,253,000
Non-accrual loans held for sale	1,400,000		3,000,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	12,205,000	2,852,000
Noncovered | Residential construction loans
Covered PCI loans
Unpaid Contractual Principal balance	400,000
Recorded Investment with No Allowance	233,000
Total Recorded Investment	233,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	117,000
Noncovered | Commercial construction loans and land development
Covered PCI loans
Unpaid Contractual Principal balance	16,205,000		16,108,000
Recorded Investment with No Allowance	8,153,000		8,062,000
Recorded Investment with Allowance	2,101,000		1,819,000
Total Recorded Investment	10,254,000		9,881,000
Related Allowance	134,000		154,000
Non-accrual loans	726,000		703,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	10,068,000	17,718,000
Noncovered | Consumer
Covered PCI loans
Unpaid Contractual Principal balance	5,215,000		5,785,000
Recorded Investment with No Allowance	97,000		171,000
Recorded Investment with Allowance	1,452,000		1,967,000
Total Recorded Investment	1,549,000		2,138,000
Related Allowance	45,000		282,000
Average investment in non-covered impaired loans
Average investment in non-covered impaired loans	1,844,000	4,120,000
Noncovered | PCI loans
Covered PCI loans
Non-accrual loans	$ 6,100,000		$ 6,600,000