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Allowance for Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | $ 1,514 |  |  | $ 535 |  |
Collectively evaluated for impairment | 19,950 |  |  | 18,944 |  |
Allowance for credit losses | 21,464 | $ 20,061 | $ 19,697 | 19,479 | $ 18,385 | $ 18,153
AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 18,227 |  | 17,628 |  |  |
AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 10 |  |  |  |  |
Collectively evaluated for impairment | 493 |  | 56 |  |  |
AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 1,504 |  | 614 |  |  |
Collectively evaluated for impairment | 2 |  | 3 |  |  |
Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 1,228 |  | 1,396 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 1,514 |  |  | 0 |  |
Collectively evaluated for impairment | 5,502 |  |  | 6,039 |  |
Allowance for credit losses | 7,016 | 5,822 | 5,535 | 6,039 | 5,867 | 5,906
Commercial | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 5,464 |  | 4,867 |  |  |
Commercial | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 10 |  |  |  |  |
Collectively evaluated for impairment | 37 |  | 51 |  |  |
Commercial | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 1,504 |  | 614 |  |  |
Collectively evaluated for impairment | 1 |  | 3 |  |  |
Commercial | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction one-to-four family |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 535 |  |
Collectively evaluated for impairment | 600 |  |  | 663 |  |
Allowance for credit losses | 600 | 521 | 550 | 1,198 | 892 | 854
Real estate construction one-to-four family | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 600 |  | 550 |  |  |
Real estate construction one-to-four family | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction one-to-four family | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction one-to-four family | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 1,778 |  |  | 1,409 |  |
Allowance for credit losses | 1,778 | 1,517 | 1,465 | 1,409 | 1,097 | 1,439
Real estate construction other | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 1,778 |  | 1,465 |  |  |
Real estate construction other | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction other | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate construction other | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 2,344 |  |  | 2,599 |  |
Allowance for credit losses | 2,344 | 2,354 | 2,358 | 2,599 | 2,285 | 1,657
Real estate term owner occupied | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 2,280 |  | 2,358 |  |  |
Real estate term owner occupied | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 64 |  | 0 |  |  |
Real estate term owner occupied | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term owner occupied | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term non-owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 7,015 |  |  | 5,401 |  |
Allowance for credit losses | 7,015 | 7,075 | 6,853 | 5,401 | 5,298 | 5,515
Real estate term non-owner occupied | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 6,634 |  | 6,853 |  |  |
Real estate term non-owner occupied | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 381 |  | 0 |  |  |
Real estate term non-owner occupied | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term non-owner occupied | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 784 |  |  | 743 |  |
Allowance for credit losses | 784 | 774 | 819 | 743 | 670 | 628
Real estate term other | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 784 |  | 819 |  |  |
Real estate term other | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term other | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Real estate term other | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Consumer secured by 1st deeds of trust |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 335 |  |  | 326 |  |
Allowance for credit losses | 335 | 327 | 313 | 326 | 346 | 264
Consumer secured by 1st deeds of trust | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 331 |  | 310 |  |  |
Consumer secured by 1st deeds of trust | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 4 |  | 3 |  |  |
Consumer secured by 1st deeds of trust | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Consumer secured by 1st deeds of trust | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Consumer other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 364 |  |  | 406 |  |
Allowance for credit losses | 364 | 362 | 408 | 406 | 420 | 397
Consumer other | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 356 |  | 406 |  |  |
Consumer other | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 7 |  | 2 |  |  |
Consumer other | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 1 |  | 0 |  |  |
Consumer other | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |
Collectively evaluated for impairment | 1,228 |  |  | 1,358 |  |
Allowance for credit losses | 1,228 | $ 1,309 | 1,396 | $ 1,358 | $ 1,510 | $ 1,493
Unallocated | AQR Pass |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Unallocated | AQR Special Mention |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Unallocated | AQR Substandard |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Unallocated | Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | $ 1,228 |  | $ 1,396 |  |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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