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Parent Company Financial Statements, Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Expenses: |  |  |
Interest expense | $ 11,773 | $ 11,797 | $ 13,440
Other expenses | 14,208 | 14,401 | 19,909
Income before income taxes and equity in undistributed income of subsidiaries | 64,963 | 62,397 | 65,172
Income tax benefit | 18,531 | 19,146 | 20,000
Net income | 46,432 | 43,251 | 45,172
Unrealized holding gains (losses) on securities available-for-sale |  |  |
Unrealized holding gains (losses) arising during the period | (342) | 13,928 | (31,878)
Less: Reclassification adjustments for realized losses included in net income | (106) | (211) | (45)
Other comprehensive income (loss), net of tax | (153) | 9,190 | (20,691)
Comprehensive income | 46,279 | 52,441 | 24,481
Parent Company [Member] |  |  |
Income: |  |  |
Dividends from subsidiary banks | 19,808 | 19,534 | 13,035
Other income | 414 | 196 | 545
Total income | 20,222 | 19,730 | 13,580
Expenses: |  |  |
Interest expense | 1,170 | 1,131 | 1,161
Depreciation expense | 130 | 153 | 163
Other expenses | 2,465 | 2,550 | 2,442
Total expenses | 3,765 | 3,834 | 3,766
Income before income taxes and equity in undistributed income of subsidiaries | 16,457 | 15,896 | 9,814
Income tax benefit | (1,371) | (1,548) | (1,416)
Income before equity in undistributed income of subsidiaries | 17,828 | 17,444 | 11,230
Equity in undistributed income of subsidiaries | 28,604 | 25,807 | 33,942
Net income | 46,432 | 43,251 | 45,172
Unrealized holding gains (losses) on securities available-for-sale |  |  |
Unrealized holding gains (losses) arising during the period | (342) | 13,928 | (31,878)
Less: Reclassification adjustments for realized losses included in net income | (106) | (211) | (45)
Tax expense (benefit) | (83) | 4,949 | (11,142)
Other comprehensive income (loss), net of tax | (153) | 9,190 | (20,691)
Comprehensive income | $ 46,279 | $ 52,441 | $ 24,481

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