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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Loss (AOCI), Net of Taxes
--- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2016 |  | 6,127,314 |  |
Balance at Dec. 31, 2016 | $ 230,563 | $ 87,392 | $ 146,464 | $ (3,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 15,976 |  | 15,976 |
Other comprehensive income (loss) | 807 |  |  | 807
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings (in shares) |  | 9,266 |  |
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings | 28 | $ 28 |  |
Stock issued under employee stock purchase plan (in shares) |  | 512 |  |
Stock issued under employee stock purchase plan | 32 | $ 32 |  |
Stock issued under employee stock ownership plan (ESOP) (in shares) |  | 29,547 |  |
Stock issued under employee stock ownership plan (ESOP) | 1,850 | $ 1,850 |  |
Restricted stock granted (in shares) |  | 16,230 |  |
Restricted stock granted |  | $ 0 |  |
Restricted stock forfeited / cancelled (in shares) |  | 0 |  |
Restricted stock forfeited / cancelled |  | $ 0 |  |
Stock-based compensation - stock options | 529 | 529 |  |
Stock-based compensation - restricted stock | 742 | $ 742 |  |
Cash dividends paid on common stock | (6,896) |  | (6,896) |
Stock purchased by directors under director stock plan (in shares) |  | 531 |  |
Stock purchased by directors under director stock plan | 35 | $ 35 |  |
Stock issued in payment of director fees (in shares) |  | 2,878 |  |
Stock issued in payment of director fees | 188 | $ 188 |  |
Stock and stock options issued to Bank of Napa shareholders (net of payment for fractional shares of $14 thousand) (in shares) |  | 735,264 |  |
Stock and stock options issued to Bank of Napa shareholders (net of payment for fractional shares of $14 thousand) | $ 53,171 | $ 53,171 |  |
Balance (in shares) at Dec. 31, 2017 | 6,921,542 | 6,921,542 |  |
Balance at Dec. 31, 2017 | $ 297,025 | $ 143,967 | 155,544 | (2,486)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 6,389 |  | 6,389 |
Other comprehensive income (loss) | (4,250) |  |  | (4,250)
Reclassification of stranded tax effects in AOCI |  |  | 638 | (638)
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings (in shares) |  | 47,787 |  |
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings | 453 | $ 453 |  |
Stock issued under employee stock purchase plan (in shares) |  | 152 |  |
Stock issued under employee stock purchase plan | 10 | $ 10 |  |
Restricted stock granted (in shares) |  | 18,520 |  |
Restricted stock surrendered for tax withholdings upon vesting (in shares) |  | (401) |  |
Restricted stock surrendered for tax withholdings upon vesting | (28) | $ (28) |  |
Restricted stock forfeited / cancelled (in shares) |  | (4,077) |  |
Stock-based compensation - stock options | 316 | $ 316 |  |
Stock-based compensation - restricted stock | 455 | $ 455 |  |
Cash dividends paid on common stock | (2,015) |  | (2,015) |
Stock purchased by directors under director stock plan (in shares) |  | 260 |  |
Stock purchased by directors under director stock plan | 18 | $ 18 |  |
Stock issued in payment of director fees (in shares) |  | 1,343 |  |
Stock issued in payment of director fees | $ 91 | $ 91 |  |
Balance (in shares) at Mar. 31, 2018 | 6,989,126 | 6,985,126 |  |
Balance at Mar. 31, 2018 | $ 298,464 | $ 145,282 | $ 160,556 | $ (7,374)

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant