Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Aged analysis of past due loans
Total Past Due	$ 6,088	$ 5,139
Current	1,518,876	1,458,387
Nonaccrual	14,683	15,283
Total Loans	1,539,647	1,478,809	$ 1,161,151
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	5,640	3,959
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	448	1,180
Multifamily
Aged analysis of past due loans
Total Past Due	1,390
Current	92,896	96,502
Nonaccrual	4,824
Total Loans	99,110	96,502
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,390
Commercial
Aged analysis of past due loans
Total Past Due	21	131
Current	256,523	227,742
Nonaccrual	216	240
Total Loans	256,760	228,113	127,709
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	21	57
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		74
Lease financing receivables
Aged analysis of past due loans
Total Past Due	898	286
Current	68,780	54,799
Nonaccrual	460	366
Total Loans	70,138	55,451	42,013
Lease financing receivables | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	898
Lease financing receivables | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		286
Real estate - commercial
Aged analysis of past due loans
Total Loans	706,103		600,942
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
Total Past Due	629	758
Current	139,964	135,599
Nonaccrual	460	879
Total Loans	141,053	137,236
Real estate - commercial | Owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	629	758
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
Current	170,186	177,755
Nonaccrual	366	385
Total Loans	170,552	178,140
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
Total Past Due	835	1,046
Current	215,423	229,315
Nonaccrual	1,085	1,930
Total Loans	217,343	232,291
Real estate - commercial | Non-owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	835	667
Real estate - commercial | Non-owner occupied general purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		379
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
Current	116,218	118,052
Nonaccrual		1,013
Total Loans	116,218	119,065
Real estate - commercial | Retail properties
Aged analysis of past due loans
Current	44,781	53,474
Nonaccrual	1,144	1,179
Total Loans	45,925	54,653
Real estate - commercial | Farm
Aged analysis of past due loans
Total Past Due	1,305	1,353
Current	13,707	13,509
Total Loans	15,012	14,862
Real estate - commercial | Farm | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,305	1,353
Real estate - residential
Aged analysis of past due loans
Total Loans	398,170		352,595
Real estate - residential | Investor
Aged analysis of past due loans
Total Past Due	98	237
Current	59,113	54,924
Nonaccrual	686	936
Total Loans	59,897	56,097
Real estate - residential | Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	3	237
Real estate - residential | Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	95
Real estate - residential | Owner occupied
Aged analysis of past due loans
Total Past Due	279	274
Current	119,355	116,900
Nonaccrual	4,187	6,452
Total Loans	123,821	123,626
Real estate - residential | Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		274
Real estate - residential | Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	279
Real estate - residential | Revolving and junior liens
Aged analysis of past due loans
Total Past Due	631	630
Current	113,685	99,374
Nonaccrual	1,026	1,622
Total Loans	115,342	101,626
Real estate - residential | Revolving and junior liens | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	557	225
Real estate - residential | Revolving and junior liens | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	74	405
Consumer
Aged analysis of past due loans
Total Past Due	2	46
Current	2,867	3,191
Nonaccrual	9
Total Loans	2,878	3,237	2,966
Consumer | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	2	10
Consumer | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		36
All other
Aged analysis of past due loans
Total Past Due		14
Current	11,937	13,176
Total Loans	11,937	13,190	12,722
All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		14
Construction Loans | Real estate - commercial
Aged analysis of past due loans
Total Loans	93,661		$ 22,204
Construction Loans | Real estate - commercial | Homebuilder
Aged analysis of past due loans
Current	1,947	3,883
Total Loans	1,947	3,883
Construction Loans | Real estate - commercial | Land
Aged analysis of past due loans
Current	2,870	3,029
Total Loans	2,870	3,029
Construction Loans | Real estate - commercial | Commercial speculative
Aged analysis of past due loans
Current	31,268	22,654
Nonaccrual	68	74
Total Loans	31,336	22,728
Construction Loans | Real estate - commercial | All other
Aged analysis of past due loans
Total Past Due		364
Current	57,356	34,509
Nonaccrual	152	207
Total Loans	$ 57,508	35,080
Construction Loans | Real estate - commercial | All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		$ 364