Allowance for Loan Losses (Activity in Allowance for Losses Disaggregated on Basis of Impairment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				$ 28,824				$ 28,594	$ 28,824	$ 28,594	$ 30,915
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(6,597)	(4,371)	(6,074)
Recoveries									908	929	1,737
Provisions for / (reallocation of) loan losses	2,851	594	691	458	428	1,078	1,308	858	4,594	3,672	2,016
Balance at the end of period	27,729				28,824				27,729	28,824	28,594
Noncovered Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				22,657				24,242	22,657	24,242	26,952
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(3,643)	(4,298)	(6,017)
Recoveries									907	929	1,737
Provisions for / (reallocation of) loan losses									2,232	1,784	1,570
Balance at the end of period	22,153				22,657				22,153	22,657	24,242
Individually evaluated for impairment	3,235				4,039				3,235	4,039
Collectively evaluated for impairment	14,868				14,374				14,868	14,374
Covered Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				6,167				4,352	6,167	4,352	3,963
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(2,954)	(73)	(57)
Recoveries									1	0	0
Provisions for / (reallocation of) loan losses									2,362	1,888	446
Balance at the end of period	5,576				6,167				5,576	6,167	4,352
Individually evaluated for impairment	423				660				423	660
Collectively evaluated for impairment	148				109				148	109
Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					4,244					4,244
PCI loans collectively evaluated for impairment	4,050								4,050
Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					5,398					5,398
PCI loans collectively evaluated for impairment	5,005								5,005
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				13,478				9,912	13,478	9,912	11,805
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(4,504)	(2,826)	(2,292)
Recoveries									716	248	1,560
Provisions for / (reallocation of) loan losses									863	6,144	(1,161)
Balance at the end of period	10,553				13,478				10,553	13,478	9,912
Commercial and Industrial | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	1,325				2,716				1,325	2,716
Collectively evaluated for impairment	6,449				6,727				6,449	6,727
Commercial and Industrial | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	9				629				9	629
Collectively evaluated for impairment	108				18				108	18
Commercial and Industrial | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					2,294					2,294
PCI loans collectively evaluated for impairment	2,191								2,191
Commercial and Industrial | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					1,094					1,094
PCI loans collectively evaluated for impairment	471								471
Owner-occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				4,049				4,021	4,049	4,021	2,979
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(337)	(247)	(1,142)
Recoveries									0	560	8
Provisions for / (reallocation of) loan losses									383	(285)	2,176
Balance at the end of period	4,095				4,049				4,095	4,049	4,021
Owner-occupied Commercial Real Estate | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	684				595				684	595
Collectively evaluated for impairment	1,629				2,101				1,629	2,101
Owner-occupied Commercial Real Estate | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	295				0				295	0
Collectively evaluated for impairment	14				7				14	7
Owner-occupied Commercial Real Estate | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					348					348
PCI loans collectively evaluated for impairment	330								330
Owner-occupied Commercial Real Estate | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					998					998
PCI loans collectively evaluated for impairment	1,143								1,143
Non-owner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				5,326				5,369	5,326	5,369	4,394
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(411)	0	(292)
Recoveries									0	0	11
Provisions for / (reallocation of) loan losses									623	(43)	1,256
Balance at the end of period	5,538				5,326				5,538	5,326	5,369
Non-owner Occupied Commercial Real Estate | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	465				364				465	364
Collectively evaluated for impairment	2,541				2,516				2,541	2,516
Non-owner Occupied Commercial Real Estate | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	66				0				66	0
Collectively evaluated for impairment	6				14				6	14
Non-owner Occupied Commercial Real Estate | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					359					359
PCI loans collectively evaluated for impairment	353								353
Non-owner Occupied Commercial Real Estate | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					2,073					2,073
PCI loans collectively evaluated for impairment	2,107								2,107
One-to-four Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,100				1,221	1,100	1,221	794
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(31)	(52)	(391)
Recoveries									7	0	0
Provisions for / (reallocation of) loan losses									124	(69)	818
Balance at the end of period	1,200				1,100				1,200	1,100	1,221
One-to-four Family Residential | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	75				0				75	0
Collectively evaluated for impairment	530				570				530	570
One-to-four Family Residential | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				31				0	31
Collectively evaluated for impairment	8				13				8	13
One-to-four Family Residential | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					216					216
PCI loans collectively evaluated for impairment	207								207
One-to-four Family Residential | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					270					270
PCI loans collectively evaluated for impairment	380								380
Real Estate Construction and Land Development: One-to-four Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,720				3,131	1,720	3,131	4,823
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(345)	(423)	(835)
Recoveries									43	0	125
Provisions for / (reallocation of) loan losses									368	(988)	(982)
Balance at the end of period	1,786				1,720				1,786	1,720	3,131
Real Estate Construction and Land Development: One-to-four Family Residential | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	396				211				396	211
Collectively evaluated for impairment	322				429				322	429
Real Estate Construction and Land Development: One-to-four Family Residential | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	51				0				51	0
Collectively evaluated for impairment	0				0				0	0
Real Estate Construction and Land Development: One-to-four Family Residential | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					291					291
PCI loans collectively evaluated for impairment	264								264
Real Estate Construction and Land Development: One-to-four Family Residential | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					789					789
PCI loans collectively evaluated for impairment	753								753
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				953				2,309	953	2,309	3,800
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									0	(142)	(445)
Recoveries									0	32	0
Provisions for / (reallocation of) loan losses									19	(1,246)	(1,046)
Balance at the end of period	972				953				972	953	2,309
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	234				0				234	0
Collectively evaluated for impairment	650				855				650	855
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	0				0				0	0
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					98					98
PCI loans collectively evaluated for impairment	88								88
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	0								0
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,597				1,761	1,597	1,761	1,410
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									(969)	(681)	(677)
Recoveries									142	89	33
Provisions for / (reallocation of) loan losses									1,999	428	995
Balance at the end of period	2,769				1,597				2,769	1,597	1,761
Consumer | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	56				153				56	153
Collectively evaluated for impairment	1,931				575				1,931	575
Consumer | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	2				0				2	0
Collectively evaluated for impairment	12				57				12	57
Consumer | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					638					638
PCI loans collectively evaluated for impairment	617								617
Consumer | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					174					174
PCI loans collectively evaluated for impairment	151								151
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				601				870	601	870	910
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for / (reallocation of) loan losses									215	(269)	(40)
Balance at the end of period	816				601				816	601	870
Unallocated | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	816				601				816	601
Unallocated | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	0				0				0	0
Unallocated | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	0								0
Unallocated | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	$ 0								$ 0