Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans - Ending Balance:
Portfolio loans, including unearned loan costs	$ 2,433,916	$ 2,137,313
Non-Covered Loans
Balance at December 31, 2014
Individually evaluated for impairment	2,394	1,550
Collectively evaluated for impairment	27,791	25,739
Total	30,185	27,289	34,330	37,989
Loans - Ending Balance:
Individually evaluated for impairment	24,366	20,840
Collectively evaluated for impairment	2,409,550	2,116,473
Total	2,433,021	2,136,292
Portfolio loans, including unearned loan costs	2,433,916	2,137,313
Non-Covered Loans | Commercial & Industrial
Balance at December 31, 2014
Individually evaluated for impairment	704	736
Collectively evaluated for impairment	16,300	11,510
Total	17,004	12,246	10,064	11,945
Loans - Ending Balance:
Individually evaluated for impairment	5,998	3,380
Collectively evaluated for impairment	1,264,261	1,038,196
Total	1,270,259	1,041,576
Non-Covered Loans | Commercial Real Estate Investor Owned
Balance at December 31, 2014
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,598	6,600
Total	4,598	6,600	10,403	6,751
Loans - Ending Balance:
Individually evaluated for impairment	5,036	6,811
Collectively evaluated for impairment	407,990	430,877
Total	413,026	437,688
Non-Covered Loans | Commercial Real Estate Owner Occupied
Balance at December 31, 2014
Individually evaluated for impairment	286	107
Collectively evaluated for impairment	3,339	3,989
Total	3,625	4,096	4,192	6,297
Loans - Ending Balance:
Individually evaluated for impairment	3,384	606
Collectively evaluated for impairment	354,119	341,025
Total	357,503	341,631
Non-Covered Loans | Construction and Land Development
Balance at December 31, 2014
Individually evaluated for impairment	352	703
Collectively evaluated for impairment	1,368	1,433
Total	1,720	2,136	5,239	5,847
Loans - Ending Balance:
Individually evaluated for impairment	6,866	9,484
Collectively evaluated for impairment	137,907	107,548
Total	144,773	117,032
Non-Covered Loans | Residential Real Estate
Balance at December 31, 2014
Individually evaluated for impairment	1,052	4
Collectively evaluated for impairment	1,778	2,015
Total	2,830	2,019	2,026	3,931
Loans - Ending Balance:
Individually evaluated for impairment	3,082	559
Collectively evaluated for impairment	182,170	157,968
Total	185,252	158,527
Non-Covered Loans | Consumer & Other
Balance at December 31, 2014
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	408	192
Total	408	192	31	14
Loans - Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	63,103	40,859
Total	62,208	39,838
Portfolio loans, including unearned loan costs	63,103	40,859
Non-Covered Loans | Unallocated
Balance at December 31, 2014
Total	$ 0	$ 0	$ 2,375	$ 3,204