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Loans - Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans by risk rating
Total Loans	$ 1,617,622	$ 1,478,809	$ 1,133,715
Multifamily
Loans by risk rating
Total Loans	129,772	96,502,000
Commercial
Loans by risk rating
Total Loans	272,851	228,113	141,315
Lease financing receivables
Loans by risk rating
Total Loans	68,325	55,451
Real estate - commercial
Loans by risk rating
Total Loans	750,991	736,247	605,721
Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	145,858	137,236
Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	171,114	178,140
Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	274,959	232,291
Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	93,171	119,065
Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	50,619	54,653
Real estate - commercial | Farm
Loans by risk rating
Total Loans	15,270	14,862
Real estate - residential
Loans by risk rating
Total Loans	426,230	377,851	351,007
Real estate - residential | Investor
Loans by risk rating
Total Loans	55,620	56,097
Real estate - residential | Multifamily
Loans by risk rating
Total Loans		96,502
Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	128,586	123,626
Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	112,252	101,626
Consumer
Loans by risk rating
Total Loans	2,774	3,237	4,216
All other
Loans by risk rating
Total Loans	11,289	13,190	11,650
Pass
Loans by risk rating
Total Loans	1,583,352	1,430,321
Pass | Multifamily
Loans by risk rating
Total Loans	125,049
Pass | Commercial
Loans by risk rating
Total Loans	270,889	214,028
Pass | Lease financing receivables
Loans by risk rating
Total Loans	67,500	53,366
Pass | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	142,843	135,503
Pass | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	169,621	172,353
Pass | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	271,731	229,448
Pass | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	89,582	114,293
Pass | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	48,321	52,207
Pass | Real estate - commercial | Farm
Loans by risk rating
Total Loans	11,755	11,840
Pass | Real estate - residential | Investor
Loans by risk rating
Total Loans	55,172	55,001
Pass | Real estate - residential | Multifamily
Loans by risk rating
Total Loans		96,502
Pass | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	122,759	115,831
Pass | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	110,353	99,286
Pass | Consumer
Loans by risk rating
Total Loans	2,754	3,236
Pass | All other
Loans by risk rating
Total Loans	11,289	13,165
Special Mention
Loans by risk rating
Total Loans	10,965	22,004
Special Mention | Commercial
Loans by risk rating
Total Loans	1,962	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	1,927	53
Special Mention | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	1,152	5,402
Special Mention | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	2,065	913
Special Mention | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,217	1,267
Special Mention | Real estate - commercial | Farm
Loans by risk rating
Total Loans	1,029	1,240
Special Mention | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	561	570
Special Mention | All other
Loans by risk rating
Total Loans		25
Substandard
Loans by risk rating
Total Loans	23,305	26,484
Substandard | Multifamily
Loans by risk rating
Total Loans	4,723
Substandard | Commercial
Loans by risk rating
Total Loans		2,527
Substandard | Lease financing receivables
Loans by risk rating
Total Loans	825	1,109
Substandard | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	1,088	1,680
Substandard | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	341	385
Substandard | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	1,163	1,930
Substandard | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	3,589	4,772
Substandard | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,081	1,179
Substandard | Real estate - commercial | Farm
Loans by risk rating
Total Loans	2,486	1,782
Substandard | Real estate - residential | Investor
Loans by risk rating
Total Loans	448	1,096
Substandard | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	5,266	7,225
Substandard | Real estate - residential | Revolving and junior liens
Loans by risk rating
Total Loans	1,899	2,340
Substandard | Consumer
Loans by risk rating
Total Loans	20	1
Construction Loans
Loans by risk rating
Total Loans	85,162	64,720	$ 19,806
Construction Loans | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,350	3,883
Construction Loans | Real estate - commercial | Land
Loans by risk rating
Total Loans	2,443	3,029
Construction Loans | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	32,028	22,728
Construction Loans | Real estate - commercial | All other
Loans by risk rating
Total Loans	48,341	35,080
Construction Loans | Pass | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	2,350	3,883
Construction Loans | Pass | Real estate - commercial | Land
Loans by risk rating
Total Loans	2,443	3,029
Construction Loans | Pass | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	32,028	22,654
Construction Loans | Pass | Real estate - commercial | All other
Loans by risk rating
Total Loans	46,913	34,696
Construction Loans | Special Mention | Real estate - commercial | All other
Loans by risk rating
Total Loans	1,052
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	$ 376	$ 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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