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Loans - Credit Quality (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Loans by risk rating
Total Loans	$ 1,601,812	$ 1,617,622	$ 1,488,021
Multifamily
Loans by risk rating
Total Loans	125,424	129,772
Commercial
Loans by risk rating
Total Loans	281,134	272,851	233,922
Lease financing receivables
Loans by risk rating
Total Loans	66,344	68,325	64,607
Real estate - commercial
Loans by risk rating
Total Loans	713,422		713,358
Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	142,286	145,858
Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	166,288	171,114
Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	254,231	274,959
Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	92,217	93,171
Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	42,577	50,619
Real estate - commercial | Farm
Loans by risk rating
Total Loans	15,823	15,270
Real estate - residential
Loans by risk rating
Total Loans	438,610		373,477
Real estate - residential | Investor
Loans by risk rating
Total Loans	56,616	55,620
Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	128,731	128,586
Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	127,839	112,252
Consumer
Loans by risk rating
Total Loans	2,120	2,774	2,913
All other
Loans by risk rating
Total Loans	8,703	11,289	12,695
Pass
Loans by risk rating
Total Loans	1,573,179	1,583,352
Pass | Multifamily
Loans by risk rating
Total Loans	125,424	125,049
Pass | Commercial
Loans by risk rating
Total Loans	278,276	270,889
Pass | Lease financing receivables
Loans by risk rating
Total Loans	65,734	67,500
Pass | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	138,424	142,843
Pass | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	164,707	169,621
Pass | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	253,551	271,731
Pass | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	88,642	89,582
Pass | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	41,373	48,321
Pass | Real estate - commercial | Farm
Loans by risk rating
Total Loans	12,134	11,755
Pass | Real estate - residential | Investor
Loans by risk rating
Total Loans	56,180	55,172
Pass | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	122,696	122,759
Pass | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	125,801	110,353
Pass | Consumer
Loans by risk rating
Total Loans	2,102	2,754
Pass | All other
Loans by risk rating
Total Loans	8,703	11,289
Special Mention
Loans by risk rating
Total Loans	11,147	10,965
Special Mention | Commercial
Loans by risk rating
Total Loans	2,858	1,962
Special Mention | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	1,821	1,927
Special Mention | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	1,141	1,152
Special Mention | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	638	2,065
Special Mention | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,204	1,217
Special Mention | Real estate - commercial | Farm
Loans by risk rating
Total Loans	1,250	1,029
Special Mention | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	559	561
Substandard
Loans by risk rating
Total Loans	17,486	23,305
Substandard | Multifamily
Loans by risk rating
Total Loans		4,723
Substandard | Lease financing receivables
Loans by risk rating
Total Loans	610	825
Substandard | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	2,041	1,088
Substandard | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	440	341
Substandard | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	42	1,163
Substandard | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	3,575	3,589
Substandard | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans		1,081
Substandard | Real estate - commercial | Farm
Loans by risk rating
Total Loans	2,439	2,486
Substandard | Real estate - residential | Investor
Loans by risk rating
Total Loans	436	448
Substandard | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	5,476	5,266
Substandard | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	2,038	1,899
Substandard | Consumer
Loans by risk rating
Total Loans	18	20
Construction Loans | Real estate - commercial
Loans by risk rating
Total Loans	91,479		$ 87,049
Construction Loans | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,503	2,350
Construction Loans | Real estate - commercial | Land
Loans by risk rating
Total Loans	2,479	2,443
Construction Loans | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	35,432	32,028
Construction Loans | Real estate - commercial | All other
Loans by risk rating
Total Loans	51,065	48,341
Construction Loans | Pass | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,503	2,350
Construction Loans | Pass | Real estate - commercial | Land
Loans by risk rating
Total Loans	2,479	2,443
Construction Loans | Pass | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	35,432	32,028
Construction Loans | Pass | Real estate - commercial | All other
Loans by risk rating
Total Loans	49,018	46,913
Construction Loans | Special Mention | Real estate - commercial | All other
Loans by risk rating
Total Loans	1,676	1,052
Construction Loans | Substandard | Real estate - commercial | All other
Loans by risk rating
Total Loans	$ 371	$ 376

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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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