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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Common Stock Shares Outstanding [Member] | Common Stock Amount Issued [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) [Member] | Treasury Stock [Member] | Deferred Compensation Arrangements [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle - equity securities |  |  |  | $ 208 | $ (208) |  |  | $ 0
Balance at Dec. 31, 2017 |  | $ 51,264 | $ 894,879 | 700,557 | (3,699) | $ (21,014) | $ 13,328 | 1,635,315
Balance (in shares) at Dec. 31, 2017 | 50,696,077 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  |  |  | 84,712 |  |  |  | 84,712
Other comprehensive income (loss), net of tax |  |  |  |  | (42,584) |  |  | (42,584)
Cash dividends declared: |  |  |  |  |  |  |  |
Common |  |  |  | (34,698) |  |  |  | (34,698)
Common stock activity under employee stock ownership plan |  | 248 | 4,396 |  |  |  |  | 4,644
Common stock activity under employee stock ownership plan (in shares) | 248,151 |  |  |  |  |  |  |
Stock-based compensation |  |  | 3,396 |  |  |  |  | 3,396
Distribution of stock under deferred compensation arrangements |  |  |  |  |  | 1,898 | (1,898) | 0
Distribution of stock under deferred compensation arrangements (in shares) | 35,233 |  |  |  |  |  |  |
Treasury stock issued to benefit plans, net |  |  | 2,242 |  |  | 3,782 | 150 | 6,174
Treasury stock issued to benefit plans, net (in shares) | 106,413 |  |  |  |  |  |  |
Balance at Jun. 30, 2018 |  | 51,512 | 904,913 | 750,779 | (46,491) | (15,334) | 11,580 | 1,656,959
Balance (in shares) at Jun. 30, 2018 | 51,085,874 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle - equity securities |  |  |  | 208 | (208) |  |  | 0
Balance at Mar. 31, 2018 |  | 51,374 | 898,036 | 723,404 | (35,226) | (17,633) | 11,511 | 1,631,466
Balance (in shares) at Mar. 31, 2018 | 50,883,603 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  |  |  | 44,606 |  |  |  | 44,606
Other comprehensive income (loss), net of tax |  |  |  |  | (11,057) |  |  | (11,057)
Cash dividends declared: |  |  |  |  |  |  |  |
Common |  |  |  | (17,439) |  |  |  | (17,439)
Common stock activity under employee stock ownership plan |  | 138 | 3,936 |  |  |  |  | 4,074
Common stock activity under employee stock ownership plan (in shares) | 137,738 |  |  |  |  |  |  |
Stock-based compensation |  |  | 1,681 |  |  |  |  | 1,681
Treasury stock issued to benefit plans, net |  |  | 1,260 |  |  | 2,299 | 69 | 3,628
Treasury stock issued to benefit plans, net (in shares) | 64,533 |  |  |  |  |  |  |
Balance at Jun. 30, 2018 |  | 51,512 | 904,913 | 750,779 | (46,491) | (15,334) | 11,580 | 1,656,959
Balance (in shares) at Jun. 30, 2018 | 51,085,874 |  |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | 51,577 | 911,748 | 795,563 | (45,305) | (11,528) | 11,728 | 1,713,783
Balance (in shares) at Dec. 31, 2018 | 51,257,824 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  |  |  | 86,961 |  |  |  | 86,961
Other comprehensive income (loss), net of tax |  |  |  |  | 40,684 |  |  | 40,684
Cash dividends declared: |  |  |  |  |  |  |  |
Common |  |  |  | (39,236) |  |  |  | (39,236)
Common stock activity under employee stock ownership plan |  | 229 | 992 |  |  |  |  | 1,221
Common stock activity under employee stock ownership plan (in shares) | 228,585 |  |  |  |  |  |  |
Stock-based compensation |  |  | 2,757 |  |  |  |  | 2,757
Distribution of stock under deferred compensation arrangements |  |  | 1,064 |  |  | 830 | (1,894) | 0
Distribution of stock under deferred compensation arrangements (in shares) | 32,431 |  |  |  |  |  |  |
Treasury stock issued to benefit plans, net |  |  | 1,294 |  |  | 1,901 | 145 | 3,340
Treasury stock issued to benefit plans, net (in shares) | 51,768 |  |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | 51,806 | 917,855 | 843,288 | (4,621) | (8,797) | 9,979 | 1,809,510
Balance (in shares) at Jun. 30, 2019 | 51,570,608 |  |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | 51,728 | 913,917 | 817,933 | (26,762) | (9,601) | 9,913 | 1,757,128
Balance (in shares) at Mar. 31, 2019 | 51,471,371 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  |  |  | 45,015 |  |  |  | 45,015
Other comprehensive income (loss), net of tax |  |  |  |  | 22,141 |  |  | 22,141
Cash dividends declared: |  |  |  |  |  |  |  |
Common |  |  |  | (19,660) |  |  |  | (19,660)
Common stock activity under employee stock ownership plan |  | 78 | 1,987 |  |  |  |  | 2,065
Common stock activity under employee stock ownership plan (in shares) | 77,666 |  |  |  |  |  |  |
Stock-based compensation |  |  | 1,366 |  |  |  |  | 1,366
Treasury stock issued to benefit plans, net |  |  | 585 |  |  | 804 | 66 | 1,455
Treasury stock issued to benefit plans, net (in shares) | 21,571 |  |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | $ 51,806 | $ 917,855 | $ 843,288 | $ (4,621) | $ (8,797) | $ 9,979 | $ 1,809,510
Balance (in shares) at Jun. 30, 2019 | 51,570,608 |  |  |  |  |  |  |

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