Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				$ 12,200				$ 8,200	$ 12,200	$ 8,200	$ 7,994
Charge-offs									(1,380)	783	(2,031)
Recoveries									72	99	377
Provisions for (reduction in) loan losses	$ 1,700	$ 1,062	$ 1,833	1,830	$ 1,421	$ 1,284	$ 1,030	949	6,425	4,684	1,860
Balance, at the end of the period	17,317				12,200				17,317	12,200	8,200
Other disclosures
Specifically evaluated impaired loans	731				0				731	0	105
General portfolio allocation	16,586				12,200				16,586	12,200	8,095
Loans individually evaluated for impairment	2,784				1,472				$ 2,784	$ 1,472	$ 2,427
Specific reserves to total loans individually evaluated for impairment									16.93%	0.00%	4.33%
Loans collectively evaluated for impairment	2,259,899				1,626,973				$ 2,259,899	$ 1,626,973	$ 1,240,825
General reserves to total loans collectively evaluated for impairment									0.73%	0.75%	0.65%
Total gross loans	2,262,683				1,628,445				$ 2,262,683	$ 1,628,445	$ 1,243,252
Total allowance to gross loans (as a percent)									0.77%	0.75%	0.66%
Multi Family And Non Owner Occupied Commercial Real Estate Loans
Allowance for Loan Losses
Annualized Trailing Period Six Considered For Determination Of Allowance For Loan Losses Factor									84 months
Business loans: Franchise loans
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,554				0	$ 1,554	$ 0	$ 0
Charge-offs									(764)	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									2,334	1,554	0
Balance, at the end of the period	3,124				1,554				3,124	1,554	0
Other disclosures
Specifically evaluated impaired loans	731				0				731	0	0
General portfolio allocation	2,393				1,554				2,393	1,554	0
Loans individually evaluated for impairment	1,630				0				$ 1,630	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									30.53%	0.00%	0.00%
Loans collectively evaluated for impairment	327,295				199,228				$ 327,295	$ 199,228	$ 0
General reserves to total loans collectively evaluated for impairment									0.73%	0.78%	0.00%
Total gross loans	328,925				199,228				$ 328,925	$ 199,228	$ 0
Total allowance to gross loans (as a percent)									0.95%	0.78%	0.00%
Business loans: Commercial and industrial
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				2,646				1,968	$ 2,646	$ 1,968	$ 1,310
Charge-offs									(484)	(223)	(509)
Recoveries									47	42	138
Provisions for (reduction in) loan losses									1,240	859	1,029
Balance, at the end of the period	3,449				2,646				3,449	2,646	1,968
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	3,449				2,646				3,449	2,646	1,968
Loans individually evaluated for impairment	313				0				$ 313	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	309,428				228,979				$ 309,428	$ 228,979	$ 187,035
General reserves to total loans collectively evaluated for impairment									1.11%	1.16%	1.05%
Total gross loans	309,741				228,979				$ 309,741	$ 228,979	$ 187,035
Total allowance to gross loans (as a percent)									1.11%	1.16%	1.05%
Business loans: Commercial owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,757				1,818	$ 1,757	$ 1,818	$ 1,512
Charge-offs									0	0	(232)
Recoveries									0	0	0
Provisions for (reduction in) loan losses									113	(61)	538
Balance, at the end of the period	1,870				1,757				1,870	1,757	1,818
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	1,870				1,757				1,870	1,757	1,818
Loans individually evaluated for impairment	536				388				$ 536	$ 388	$ 747
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	294,190				210,607				$ 294,190	$ 210,607	$ 220,342
General reserves to total loans collectively evaluated for impairment									0.64%	0.83%	0.83%
Total gross loans	294,726				210,995				$ 294,726	$ 210,995	$ 221,089
Total allowance to gross loans (as a percent)									0.63%	0.83%	0.82%
Business loans: SBA
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				568				151	$ 568	$ 151	$ 79
Charge-offs									0	0	(143)
Recoveries									8	4	50
Provisions for (reduction in) loan losses									924	413	165
Balance, at the end of the period	1,500				568				1,500	568	151
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	1,500				568				1,500	568	151
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 14
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	62,256				28,404				$ 62,256	$ 28,404	$ 10,645
General reserves to total loans collectively evaluated for impairment									2.41%	2.00%	1.42%
Total gross loans	62,256				28,404				$ 62,256	$ 28,404	$ 10,659
Total allowance to gross loans (as a percent)									2.41%	2.00%	1.42%
Business loans: Warehouse facilities
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				546				392	$ 546	$ 392	$ 1,544
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									213	154	(1,152)
Balance, at the end of the period	759				546				759	546	392
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	759				546				759	546	392
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	143,200				113,798				$ 143,200	$ 113,798	$ 87,517
General reserves to total loans collectively evaluated for impairment									0.53%	0.48%	0.45%
Total gross loans	143,200				113,798				$ 143,200	$ 113,798	$ 87,517
Total allowance to gross loans (as a percent)									0.53%	0.48%	0.45%
Real estate loans: Commercial non-owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				2,007				1,658	$ 2,007	$ 1,658	$ 1,459
Charge-offs									(116)	(365)	(756)
Recoveries									3	0	0
Provisions for (reduction in) loan losses									154	714	955
Balance, at the end of the period	2,048				2,007				2,048	2,007	1,658
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	1
General portfolio allocation	2,048				2,007				2,048	2,007	1,657
Loans individually evaluated for impairment	214				848				$ 214	$ 848	$ 983
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.10%
Loans collectively evaluated for impairment	421,369				358,365				$ 421,369	$ 358,365	$ 332,561
General reserves to total loans collectively evaluated for impairment									0.49%	0.56%	0.50%
Total gross loans	421,583				359,213				$ 421,583	$ 359,213	$ 333,544
Total allowance to gross loans (as a percent)									0.49%	0.56%	0.50%
Real estate loans: Multi-family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,060				817	$ 1,060	$ 817	$ 1,145
Charge-offs									0	0	(101)
Recoveries									0	0	0
Provisions for (reduction in) loan losses									523	243	(227)
Balance, at the end of the period	1,583				1,060				1,583	1,060	817
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	1,583				1,060				1,583	1,060	817
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	429,003				262,965				$ 429,003	$ 262,965	$ 233,689
General reserves to total loans collectively evaluated for impairment									0.37%	0.40%	0.35%
Total gross loans	429,003				262,965				$ 429,003	$ 262,965	$ 233,689
Total allowance to gross loans (as a percent)									0.37%	0.40%	0.35%
Real estate loans: One-to-four family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				842				1,099	$ 842	$ 1,099	$ 862
Charge-offs									(16)	(195)	(272)
Recoveries									13	34	47
Provisions for (reduction in) loan losses									(141)	(96)	462
Balance, at the end of the period	698				842				698	842	1,099
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	104
General portfolio allocation	698				842				698	842	995
Loans individually evaluated for impairment	70				236				$ 70	$ 236	$ 683
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	15.23%
Loans collectively evaluated for impairment	79,980				122,559				$ 79,980	$ 122,559	$ 144,552
General reserves to total loans collectively evaluated for impairment									0.87%	0.69%	0.69%
Total gross loans	80,050				122,795				$ 80,050	$ 122,795	$ 145,235
Total allowance to gross loans (as a percent)									0.87%	0.69%	0.76%
Real estate loans: Construction
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,088				136	$ 1,088	$ 136	$ 0
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									942	952	136
Balance, at the end of the period	2,030				1,088				2,030	1,088	136
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	2,030				1,088				2,030	1,088	136
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	169,748				89,682				$ 169,748	$ 89,682	$ 13,040
General reserves to total loans collectively evaluated for impairment									1.20%	1.21%	1.04%
Total gross loans	169,748				89,682				$ 169,748	$ 89,682	$ 13,040
Total allowance to gross loans (as a percent)									1.20%	1.21%	1.04%
Real estate loans: Land
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				108				127	$ 108	$ 127	$ 31
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									125	(19)	96
Balance, at the end of the period	233				108				233	108	127
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	233				108				233	108	127
Loans individually evaluated for impairment	21				0				$ 21	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	18,319				9,088				$ 18,319	$ 9,088	$ 7,605
General reserves to total loans collectively evaluated for impairment									1.27%	1.19%	1.67%
Total gross loans	18,340				9,088				$ 18,340	$ 9,088	$ 7,605
Total allowance to gross loans (as a percent)									1.27%	1.19%	1.67%
Other loans
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				$ 24				$ 34	$ 24	$ 34	$ 52
Charge-offs									0	0	(18)
Recoveries									1	19	142
Provisions for (reduction in) loan losses									(2)	(29)	(142)
Balance, at the end of the period	23				24				23	24	34
Other disclosures
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	23				24				23	24	34
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	5,111				3,298				$ 5,111	$ 3,298	$ 3,839
General reserves to total loans collectively evaluated for impairment									0.45%	0.73%	0.89%
Total gross loans	$ 5,111				$ 3,298				$ 5,111	$ 3,298	$ 3,839
Total allowance to gross loans (as a percent)									0.45%	0.73%	0.89%
Owner Occupied Commercial Real Estate Loans Commercial And Industrial Loans And Small Business Administration Loans
Allowance for Loan Losses
Annualized Trailing Period One Considered For Determination Of Allowance For Loan Losses Factor									72 months
Annualized Trailing Period Two Considered For Determination Of Allowance For Loan Losses Factor									36 months
Annualized Trailing Period Three Considered For Determination Of Allowance For Loan Losses Factor									24 months
Annualized Trailing Period Four Considered For Determination Of Allowance For Loan Losses Factor									12 months
Annualized Trailing Period Five Considered For Determination Of Allowance For Loan Losses Factor									6 months
Period One Considered for Comparison of Allowance for Loan Losses Factor									10 years
Period Two Considered for Comparison of Allowance for Loan Losses Factor									15 years