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Loans - Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Loans by risk rating
Total Loans	$ 1,594,191	$ 1,478,809	$ 1,202,852
Multifamily
Loans by risk rating
Total Loans	122,301	96,502
Commercial
Loans by risk rating
Total Loans	257,356	228,113	136,819
Lease financing receivables
Loans by risk rating
Total Loans	69,305	55,451	47,215
Real estate - commercial
Loans by risk rating
Total Loans	739,136		617,280
Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	155,676	137,236
Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	173,738	178,140
Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	253,747	232,291
Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	93,746	119,065
Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	46,262	54,653
Real estate - commercial | Farm
Loans by risk rating
Total Loans	15,967	14,862
Real estate - residential
Loans by risk rating
Total Loans	419,583		357,846
Real estate - residential | Investor
Loans by risk rating
Total Loans	52,853	56,097
Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	128,581	123,626
Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	115,848	101,626
Consumer
Loans by risk rating
Total Loans	2,770	3,237	3,325
All other
Loans by risk rating
Total Loans	11,173	13,190	11,581
Pass
Loans by risk rating
Total Loans	1,551,885	1,430,321
Pass | Multifamily
Loans by risk rating
Total Loans	117,544	96,502
Pass | Commercial
Loans by risk rating
Total Loans	245,603	214,028
Pass | Lease financing receivables
Loans by risk rating
Total Loans	68,274	53,366
Pass | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	153,039	135,503
Pass | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	172,216	172,353
Pass | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	250,497	229,448
Pass | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	90,113	114,293
Pass | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	43,922	52,207
Pass | Real estate - commercial | Farm
Loans by risk rating
Total Loans	13,472	11,840
Pass | Real estate - residential | Investor
Loans by risk rating
Total Loans	52,205	55,001
Pass | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	123,600	115,831
Pass | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	113,871	99,286
Pass | Consumer
Loans by risk rating
Total Loans	2,762	3,236
Pass | All other
Loans by risk rating
Total Loans	11,173	13,165
Special Mention
Loans by risk rating
Total Loans	18,577	22,004
Special Mention | Commercial
Loans by risk rating
Total Loans	11,371	11,558
Special Mention | Lease financing receivables
Loans by risk rating
Total Loans		976
Special Mention | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	1,274	53
Special Mention | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	1,163	5,402
Special Mention | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	2,085	913
Special Mention | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,227	1,267
Special Mention | Real estate - commercial | Farm
Loans by risk rating
Total Loans		1,240
Special Mention | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	563	570
Special Mention | All other
Loans by risk rating
Total Loans		25
Substandard
Loans by risk rating
Total Loans	23,729	26,484
Substandard | Multifamily
Loans by risk rating
Total Loans	4,757
Substandard | Commercial
Loans by risk rating
Total Loans	382	2,527
Substandard | Lease financing receivables
Loans by risk rating
Total Loans	1,031	1,109
Substandard | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	1,363	1,680
Substandard | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	359	385
Substandard | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	1,165	1,930
Substandard | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	3,633	4,772
Substandard | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,113	1,179
Substandard | Real estate - commercial | Farm
Loans by risk rating
Total Loans	2,495	1,782
Substandard | Real estate - residential | Investor
Loans by risk rating
Total Loans	648	1,096
Substandard | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	4,418	7,225
Substandard | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	1,977	2,340
Substandard | Consumer
Loans by risk rating
Total Loans	8	1
Construction Loans | Real estate - commercial
Loans by risk rating
Total Loans	94,868		$ 28,786
Construction Loans | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,644	3,883
Construction Loans | Real estate - commercial | Land
Loans by risk rating
Total Loans	3,235	3,029
Construction Loans | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	34,817	22,728
Construction Loans | Real estate - commercial | All other
Loans by risk rating
Total Loans	54,172	35,080
Construction Loans | Pass | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,644	3,883
Construction Loans | Pass | Real estate - commercial | Land
Loans by risk rating
Total Loans	3,235	3,029
Construction Loans | Pass | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	34,817	22,654
Construction Loans | Pass | Real estate - commercial | All other
Loans by risk rating
Total Loans	52,898	34,696
Construction Loans | Special Mention | Real estate - commercial | All other
Loans by risk rating
Total Loans	894
Construction Loans | Substandard | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans		74
Construction Loans | Substandard | Real estate - commercial | All other
Loans by risk rating
Total Loans	$ 380	$ 384

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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