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Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands | Purchase of Common Shares Outstanding [Member] Treasury Stock [Member] | Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member] Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member] Treasury Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 |  |  |  | $ 315 | $ 198,314 | $ (10,257) | $ 241,856 | $ 12,137 |
Common Stock |  |  |  |  |  |  |  |  |
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (26) |
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 696 | $ (696)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 3,261 | 3,261
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (26,541) | (26,541)
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (902) | 1,700
Net income |  |  |  |  |  |  | 37,752 |  | 37,752
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  | 1,652 |  |  |  |
Value of shares issued upon vesting of restricted stock unit awards |  |  |  |  | 161 | 2,406 | (119) |  |
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  |  |  | (15,618) |  |
Value of stock options exercised |  |  |  |  | 1,451 | 6,763 | (128) |  | 6,814
Stock-based compensation activity, net |  |  |  |  | (119) |  |  |  |
Stock-based income tax benefit |  |  |  |  | 443 |  |  |  |
Balance at Dec. 31, 2013 |  |  |  | 315 | 201,902 | (22,053) | 263,743 | (11,375) | 432,532
Treasury Stock |  |  |  |  |  |  |  |  |
Value of shares purchased for the Treasury | $ (13,152) | $ (999) | $ (6,814) |  |  |  |  |  |
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (26) |
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 370 | (370)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (3,790) | (3,790)
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 13,548 | 13,548
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (1,634) | 1,634
Net income |  |  |  |  |  |  | 44,239 |  | 44,239
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  | 2,075 |  |  |  |
Value of shares issued upon vesting of restricted stock unit awards |  |  |  |  | 30 | 3,205 | (430) |  |
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  |  |  | (17,852) |  |
Value of stock options exercised |  |  |  |  | 455 | 2,461 | (77) |  | 1,962
Stock-based compensation activity, net |  |  |  |  | 1,129 |  |  |  |
Stock-based income tax benefit |  |  |  |  | 846 |  |  |  |
Balance at Dec. 31, 2014 |  |  |  | 315 | 206,437 | (37,221) | 289,623 | (2,907) | 456,247
Treasury Stock |  |  |  |  |  |  |  |  |
Value of shares purchased for the Treasury | (17,644) | (1,228) | (1,962) |  |  |  |  |  |
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (26) |
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 669 | (669)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | 615 | 615
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (3,818) | (3,818)
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively |  |  |  |  |  |  |  | (95) | 95
Net income |  |  |  |  |  |  | 46,209 |  | 46,209
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  | 2,092 |  |  |  |
Value of shares issued upon vesting of restricted stock unit awards |  |  |  |  | 160 | 3,580 | (504) |  |
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively) |  |  |  |  |  |  | (18,616) |  |
Value of stock options exercised |  |  |  |  | 54 | 825 | (182) |  | 447
Stock-based compensation activity, net |  |  |  |  | 1,335 |  |  |  |
Stock-based income tax benefit |  |  |  |  | 574 |  |  |  |
Balance at Dec. 31, 2015 |  |  |  | $ 315 | $ 210,652 | $ (48,868) | $ 316,530 | $ (5,562) | $ 473,067
Treasury Stock |  |  |  |  |  |  |  |  |
Value of shares purchased for the Treasury | $ (14,351) | $ (1,254) | $ (447) |  |  |  |  |  |

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