Loans Days past due and Non-accruing (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other information concerning the credit quality
Total Gross Loans	$ 2,262,683	$ 1,628,445	$ 1,243,252
Non-accruing	3,970	1,444
Business loans: Commercial and industrial
Other information concerning the credit quality
Total Gross Loans	309,741	228,979	187,035
Non-accruing	463	0
Business loans: Franchise loans
Other information concerning the credit quality
Total Gross Loans	328,925	199,228	0
Non-accruing	1,630	0
Business loans: Commercial owner occupied
Other information concerning the credit quality
Total Gross Loans	294,726	210,995	221,089
Non-accruing	536	514
Business loans: SBA
Other information concerning the credit quality
Total Gross Loans	62,256	28,404	10,659
Non-accruing	0	0
Business loans: Warehouse facilities
Other information concerning the credit quality
Total Gross Loans	143,200	113,798	87,517
Non-accruing	0	0
Real estate loans: Commercial non-owner occupied
Other information concerning the credit quality
Total Gross Loans	421,583	359,213	333,544
Non-accruing	1,164	848
Real estate loans: Multi-family
Other information concerning the credit quality
Total Gross Loans	429,003	262,965	233,689
Non-accruing	0	0
Real estate loans: One-to-four family
Other information concerning the credit quality
Total Gross Loans	80,050	122,795	145,235
Non-accruing	155	82
Real estate loans: Construction
Other information concerning the credit quality
Total Gross Loans	169,748	89,682	13,040
Non-accruing	0	0
Real estate loans: Land
Other information concerning the credit quality
Total Gross Loans	18,340	9,088	7,605
Non-accruing	21	0
Other loans
Other information concerning the credit quality
Total Gross Loans	5,111	3,298	$ 3,839
Non-accruing	1	0
Current
Other information concerning the credit quality
Current	2,260,051	1,628,347
Current | Business loans: Commercial and industrial
Other information concerning the credit quality
Current	309,464	228,955
Current | Business loans: Franchise loans
Other information concerning the credit quality
Current	327,295	199,228
Current | Business loans: Commercial owner occupied
Other information concerning the credit quality
Current	294,371	210,995
Current | Business loans: SBA
Other information concerning the credit quality
Current	62,256	28,404
Current | Business loans: Warehouse facilities
Other information concerning the credit quality
Current	143,200	113,798
Current | Real estate loans: Commercial non-owner occupied
Other information concerning the credit quality
Current	421,369	359,213
Current | Real estate loans: Multi-family
Other information concerning the credit quality
Current	429,003	262,965
Current | Real estate loans: One-to-four family
Other information concerning the credit quality
Current	79,915	122,722
Current | Real estate loans: Construction
Other information concerning the credit quality
Current	169,748	89,682
Current | Real estate loans: Land
Other information concerning the credit quality
Current	18,319	9,088
Current | Other loans
Other information concerning the credit quality
Current	5,111	3,297
30-59
Other information concerning the credit quality
Days Past Due	323	20
30-59 | Business loans: Commercial and industrial
Other information concerning the credit quality
Days Past Due	20	0
30-59 | Business loans: Franchise loans
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Business loans: Commercial owner occupied
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Business loans: SBA
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Business loans: Warehouse facilities
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Real estate loans: Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	214	0
30-59 | Real estate loans: Multi-family
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Real estate loans: One-to-four family
Other information concerning the credit quality
Days Past Due	89	19
30-59 | Real estate loans: Construction
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Real estate loans: Land
Other information concerning the credit quality
Days Past Due	0	0
30-59 | Other loans
Other information concerning the credit quality
Days Past Due	0	1
60-89
Other information concerning the credit quality
Days Past Due	355	24
60-89 | Business loans: Commercial and industrial
Other information concerning the credit quality
Days Past Due	0	24
60-89 | Business loans: Franchise loans
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Business loans: Commercial owner occupied
Other information concerning the credit quality
Days Past Due	355	0
60-89 | Business loans: SBA
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Business loans: Warehouse facilities
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Real estate loans: Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Real estate loans: Multi-family
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Real estate loans: One-to-four family
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Real estate loans: Construction
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Real estate loans: Land
Other information concerning the credit quality
Days Past Due	0	0
60-89 | Other loans
Other information concerning the credit quality
Days Past Due	0	0
90
Other information concerning the credit quality
Days Past Due	1,954	54
90 | Business loans: Commercial and industrial
Other information concerning the credit quality
Days Past Due	257	0
90 | Business loans: Franchise loans
Other information concerning the credit quality
Days Past Due	1,630	0
90 | Business loans: Commercial owner occupied
Other information concerning the credit quality
Days Past Due	0	0
90 | Business loans: SBA
Other information concerning the credit quality
Days Past Due	0	0
90 | Business loans: Warehouse facilities
Other information concerning the credit quality
Days Past Due	0	0
90 | Real estate loans: Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	0	0
90 | Real estate loans: Multi-family
Other information concerning the credit quality
Days Past Due	0	0
90 | Real estate loans: One-to-four family
Other information concerning the credit quality
Days Past Due	46	54
90 | Real estate loans: Construction
Other information concerning the credit quality
Days Past Due	0	0
90 | Real estate loans: Land
Other information concerning the credit quality
Days Past Due	21	0
90 | Other loans
Other information concerning the credit quality
Days Past Due	$ 0	$ 0