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Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Aged analysis of past due loans
Total Past Due	$ 5,606	$ 5,139
Current	1,597,628	1,458,387
Nonaccrual	14,388	15,283
Total Loans	1,617,622	1,478,809	$ 1,133,715
Recorded Investment 90 days or Greater Past Due and Accruing	254
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	4,212	3,959
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	1,146	1,180
90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	248
Multifamily
Aged analysis of past due loans
Current	125,049	96,502,000
Nonaccrual	4,723
Total Loans	129,772	96,502,000
Commercial
Aged analysis of past due loans
Total Past Due	1,270	131
Current	271,581	227,742
Nonaccrual		240
Total Loans	272,851	228,113	141,315
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	995	57
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	275	74
Lease financing receivables
Aged analysis of past due loans
Total Past Due		286
Current	68,147	54,799
Nonaccrual	178	366
Total Loans	68,325	55,451
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	750,991	736,247	605,721
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
Total Past Due	1,136	758
Current	144,267	135,599
Nonaccrual	455	879
Total Loans	145,858	137,236
Real estate - commercial | Owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,136	758
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
Total Past Due	226
Current	170,546	177,755
Nonaccrual	342	385
Total Loans	171,114	178,140
Real estate - commercial | Owner occupied special purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	226
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
Total Past Due	593	1,046
Current	273,203	229,315
Nonaccrual	1,163	1,930
Total Loans	274,959	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		667
Real estate - commercial | Non-owner occupied general purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	593	379
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
Total Past Due	248
Current	92,923	118,052
Nonaccrual		1,013
Total Loans	93,171	119,065
Recorded Investment 90 days or Greater Past Due and Accruing	254
Real estate - commercial | Non-owner occupied special purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	248
Real estate - commercial | Retail properties
Aged analysis of past due loans
Current	49,538	53,474
Nonaccrual	1,081	1,179
Total Loans	50,619	54,653
Real estate - commercial | Farm
Aged analysis of past due loans
Total Past Due		1,353
Current	15,270	13,509
Total Loans	15,270	14,862
Real estate - commercial | Farm | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		1,353
Real estate - residential
Aged analysis of past due loans
Total Loans	426,230	377,851	351,007
Real estate - residential | Investor
Aged analysis of past due loans
Total Past Due		237
Current	55,248	54,924
Nonaccrual	372	936
Total Loans	55,620	56,097
Real estate - residential | Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		237
Real estate - residential | Multifamily
Aged analysis of past due loans
Total Loans		96,502
Real estate - residential | Owner occupied
Aged analysis of past due loans
Total Past Due	74	274
Current	123,838	116,900
Nonaccrual	4,674	6,452
Total Loans	128,586	123,626
Real estate - residential | Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	74	274
Real estate - residential | Revolving and junior liens
Aged analysis of past due loans
Total Past Due	769	630
Current	110,291	99,374
Nonaccrual	1,192	1,622
Total Loans	112,252	101,626
Real estate - residential | Revolving and junior liens | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	491	225
Real estate - residential | Revolving and junior liens | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	278	405
Consumer
Aged analysis of past due loans
Total Past Due		46
Current	2,767	3,191
Nonaccrual	7
Total Loans	2,774	3,237	4,216
Consumer | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		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	37	14
Current	11,252	13,176
Total Loans	11,289	13,190	11,650
All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	37	14
Construction Loans
Aged analysis of past due loans
Total Loans	85,162	64,720	$ 19,806
Construction Loans | Real estate - commercial | Homebuilder
Aged analysis of past due loans
Total Past Due	129
Current	2,221	3,883
Total Loans	2,350	3,883
Construction Loans | Real estate - commercial | Homebuilder | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	129
Construction Loans | Real estate - commercial | Land
Aged analysis of past due loans
Total Past Due	1,124
Current	1,319	3,029
Total Loans	2,443	3,029
Construction Loans | Real estate - commercial | Land | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,124
Construction Loans | Real estate - commercial | Commercial speculative
Aged analysis of past due loans
Current	32,028	22,654
Nonaccrual		74
Total Loans	32,028	22,728
Construction Loans | Real estate - commercial | All other
Aged analysis of past due loans
Total Past Due		364
Current	48,140	34,509
Nonaccrual	201	207
Total Loans	$ 48,341	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

X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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+ References

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