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Parent Company Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Assets:        
Cash on deposit $ 73,451 $ 69,723    
Goodwill 65,490 65,490 65,499 65,059
Premises and equipment, net 54,321 54,297    
Other assets 31,882 33,660    
Total assets 3,635,664 3,591,179    
Liabilities and shareholders' equity:        
Other liabilities 46,268 32,723    
Total liabilities 3,235,320 3,224,313    
Shareholders' equity 400,344 366,866    
Total liabilities and shareholders' equity 3,635,664 3,591,179    
Expenses: [Abstract]        
Interest expense 21,588 27,005 35,257  
Other expenses 17,760 19,432 15,947  
Income before income taxes and equity in undistributed income of subsidiaries 65,087 55,638 47,646  
Income tax benefit 20,225 16,811 14,612  
Net income 44,862 38,827 33,034  
Unrealized holding gains (losses) on securities available-for-sale [Abstract]        
Unrealized holding gains arising during the period 4,973 9,868 (464)  
Less: Reclassification adjustments for realized gains included in net income (1,155) (218) 0  
Other comprehensive income (loss), net of tax 2,482 6,272 (302)  
Comprehensive income 47,344 45,099 32,732  
Cash flows from operating activities:        
Net income 44,862 38,827 33,034  
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 4,324 4,216 4,377  
Stock-based compensation 592 650 804  
Excess tax benefit of stock-based compensation (496) (23) (205)  
Changes in:        
Other assets 1,792 (746) 1,259  
Other liabilities 7,130 (1,213) 1,644  
Net cash provided by operating activities 57,896 64,326 61,304  
Cash flows from investing activities:        
Purchase of premises and equipment (4,301) (3,116) (2,426)  
Net cash used in investing activities (70,963) (172,293) (111,803)  
Cash flows from financing activities:        
Issuance of common stock 4,395 1,291 1,875  
Excess tax benefits of stock-based compensation (496) (23) (205)  
Dividends paid (19,215) (18,742) (18,332)  
Net cash used in financing activities (17,854) 187,465 67,353  
Net increase in cash and cash equivalents (30,921) 79,498 16,854  
Cash and cash equivalents at beginning of year 238,481 158,983 142,129  
Cash and cash equivalents at end of year 207,560 238,481 158,983  
Parent Company [Member]
        
Assets:        
Cash on deposit 5,442 6,105    
Investment in and advances to subsidiaries 454,949 421,572    
Goodwill 4,973 4,973    
Premises and equipment, net 250 211    
Other assets 1,277 498    
Total assets 466,891 433,359    
Liabilities and shareholders' equity:        
Long-term debt 61,341 61,341    
Other liabilities 5,206 5,152    
Total liabilities 66,547 66,493    
Shareholders' equity 400,344 366,866    
Total liabilities and shareholders' equity 466,891 433,359    
Income: [Abstract]        
Dividends from subsidiary banks 16,572 20,370 34,620  
Other income 238 255 34  
Total income 16,810 20,625 34,654  
Expenses: [Abstract]        
Interest expense 2,403 3,999 3,999  
Depreciation expense 127 72 25  
Other expenses 1,990 1,808 1,557  
Total expenses 4,520 5,879 5,581  
Income before income taxes and equity in undistributed income of subsidiaries 12,290 14,746 29,073  
Income tax benefit (1,750) (2,277) (2,145)  
Income before equity in undistributed income of subsidiaries 14,040 17,023 31,218  
Equity in undistributed income of subsidiaries 30,822 21,804 1,816  
Net income 44,862 38,827 33,034  
Unrealized holding gains (losses) on securities available-for-sale [Abstract]        
Unrealized holding gains arising during the period 4,973 9,868 (464)  
Less: Reclassification adjustments for realized gains included in net income (1,155) (218) 0  
Tax expense (benefit) 1,336 3,378 (162)  
Other comprehensive income (loss), net of tax 2,482 6,272 (302)  
Comprehensive income 47,344 45,099 32,732  
Cash flows from operating activities:        
Net income 44,862 38,827 33,034  
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 127 72 25  
Equity in undistributed earnings of subsidiaries (30,822) (21,804) (1,816)  
Stock-based compensation 512 555 393  
Excess tax benefit of stock-based compensation 496 23 205  
Changes in:        
Other assets (771) 395 1,795  
Other liabilities 495 0 675  
Net cash provided by operating activities 14,899 18,068 34,311  
Cash flows from investing activities:        
Purchase of premises and equipment (166) (198) (76)  
Repayment of investments in and advances to subsidiaries (80) (96) (411)  
Additional investment in subsidiaries 0 0 (17,306)  
Net cash used in investing activities (246) (294) (17,793)  
Cash flows from financing activities:        
Issuance of common stock 4,395 1,291 1,875  
Excess tax benefits of stock-based compensation (496) (23) (205)  
Dividends paid (19,215) (18,742) (18,332)  
Net cash used in financing activities (15,316) (17,474) (16,662)  
Net increase in cash and cash equivalents (663) 300 (144)  
Cash and cash equivalents at beginning of year 6,105 5,805 5,949  
Cash and cash equivalents at end of year $ 5,442 $ 6,105 $ 5,805