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Loans - Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Loans by risk rating
Total Loans	$ 1,849,162	$ 1,617,622	$ 1,539,647
Multifamily
Loans by risk rating
Total Loans	192,115	129,772
Commercial
Loans by risk rating
Total Loans	299,536	272,851	256,760
Lease financing receivables
Loans by risk rating
Total Loans	66,687	68,325	70,138
Real estate - commercial
Loans by risk rating
Total Loans			706,103
Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	175,098	145,858
Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	197,011	171,114
Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	283,094	274,959
Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	90,803	93,171
Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	47,582	50,619
Real estate - commercial | Farm
Loans by risk rating
Total Loans	14,676	15,270
Real estate - residential
Loans by risk rating
Total Loans			282,118
Real estate - residential | Investor
Loans by risk rating
Total Loans	73,879	55,620
Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	138,914	128,005
Consumer
Loans by risk rating
Total Loans			116,052
All other
Loans by risk rating
Total Loans	15,081	14,063	14,815
Pass
Loans by risk rating
Total Loans	1,798,709	1,583,352
Pass | Multifamily
Loans by risk rating
Total Loans	188,813	125,049
Pass | Commercial
Loans by risk rating
Total Loans	298,512	270,889
Pass | Lease financing receivables
Loans by risk rating
Total Loans	66,148	67,500
Pass | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	166,962	142,843
Pass | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	195,009	169,621
Pass | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	275,728	271,731
Pass | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	87,704	89,582
Pass | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	45,755	48,321
Pass | Real estate - commercial | Farm
Loans by risk rating
Total Loans	13,428	11,755
Pass | Real estate - residential | Investor
Loans by risk rating
Total Loans	72,759	55,172
Pass | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	133,485	122,178
Pass | All other
Loans by risk rating
Total Loans	15,063	14,043
Special Mention
Loans by risk rating
Total Loans	12,921	10,965
Special Mention | Commercial
Loans by risk rating
Total Loans	631	1,962
Special Mention | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	4,915	1,927
Special Mention | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	254	1,152
Special Mention | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	4,899	2,065
Special Mention | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans		1,217
Special Mention | Real estate - commercial | Farm
Loans by risk rating
Total Loans		1,029
Special Mention | Real estate - residential | Investor
Loans by risk rating
Total Loans	91
Special Mention | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	1	561
Substandard
Loans by risk rating
Total Loans	37,532	23,305
Substandard | Multifamily
Loans by risk rating
Total Loans	3,302	4,723
Substandard | Commercial
Loans by risk rating
Total Loans	393
Substandard | Lease financing receivables
Loans by risk rating
Total Loans	539	825
Substandard | Real estate - commercial | Owner occupied general purpose
Loans by risk rating
Total Loans	3,221	1,088
Substandard | Real estate - commercial | Owner occupied special purpose
Loans by risk rating
Total Loans	1,748	341
Substandard | Real estate - commercial | Non-owner occupied general purpose
Loans by risk rating
Total Loans	2,467	1,163
Substandard | Real estate - commercial | Non-owner occupied special purpose
Loans by risk rating
Total Loans	3,099	3,589
Substandard | Real estate - commercial | Retail properties
Loans by risk rating
Total Loans	1,827	1,081
Substandard | Real estate - commercial | Farm
Loans by risk rating
Total Loans	1,248	2,486
Substandard | Real estate - residential | Investor
Loans by risk rating
Total Loans	1,029	448
Substandard | Real estate - residential | Owner occupied
Loans by risk rating
Total Loans	5,428	5,266
Substandard | All other
Loans by risk rating
Total Loans	18	20
PCI
Loans by risk rating
Total Loans	11,214
PCI | Substandard
Loans by risk rating
Total Loans	11,214
Non-PCI
Loans by risk rating
Total Loans	1,837,948	1,617,622
Non-PCI | Pass
Loans by risk rating
Total Loans	1,798,709
Non-PCI | Special Mention
Loans by risk rating
Total Loans	12,921
Non-PCI | Substandard
Loans by risk rating
Total Loans	26,318
Construction Loans | Real estate - commercial
Loans by risk rating
Total Loans			$ 93,661
Construction Loans | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	7,649	2,350
Construction Loans | Real estate - commercial | Land
Loans by risk rating
Total Loans	9,168	2,443
Construction Loans | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	39,730	32,028
Construction Loans | Real estate - commercial | All other
Loans by risk rating
Total Loans	58,939	48,341
Construction Loans | Pass | Real estate - commercial | Homebuilder
Loans by risk rating
Total Loans	7,649	2,350
Construction Loans | Pass | Real estate - commercial | Land
Loans by risk rating
Total Loans	9,168	2,443
Construction Loans | Pass | Real estate - commercial | Commercial speculative
Loans by risk rating
Total Loans	39,730	32,028
Construction Loans | Pass | Real estate - commercial | All other
Loans by risk rating
Total Loans	56,443	46,913
Construction Loans | Special Mention | Real estate - commercial | All other
Loans by risk rating
Total Loans	2,130	1,052
Construction Loans | Substandard | Real estate - commercial | All other
Loans by risk rating
Total Loans	366	376
Home Equity Line of Credit | Real estate - residential
Loans by risk rating
Total Loans	127,986	112,833
Home Equity Line of Credit | Pass | Real estate - residential
Loans by risk rating
Total Loans	126,353	110,934
Home Equity Line of Credit | Substandard | Real estate - residential
Loans by risk rating
Total Loans	$ 1,633	$ 1,899

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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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