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Schedule of Allowance for Loan Losses by Portfolio Segment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 100,511 $ 112,581 $ 120,480
Provision charged to operating expense (6,125) 40,750 58,151
Less loans charged-off (20,513) (60,936) (71,281)
Add back recoveries of loans previously charged-off 11,466 8,116 5,231
Ending balance 85,339 100,511 112,581
Allowance for loan losses:      
Loans individually evaluated for impairment 8,929 10,297 32,838
Loans collectively evaluated for impairment 76,410 90,214 79,743
Ending balance 85,339 100,511 112,581
Total loans:      
Individually evaluated for impairment 110,572 136,185 230,596
Individually evaluated for impairment 4,234,281 4,087,727 3,955,953
Total Loans 4,344,853 4,223,912 4,186,549
Real Estate
     
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 75,782 87,396 84,181
Provision charged to operating expense (7,722) 28,651 46,844
Less loans charged-off (10,224) (43,506) (45,764)
Add back recoveries of loans previously charged-off 6,087 3,241 2,135
Ending balance 63,923 75,782 87,396
Allowance for loan losses:      
Loans individually evaluated for impairment 7,339 8,350 28,023
Loans collectively evaluated for impairment 56,584 67,432 59,373
Ending balance 63,923 75,782 87,396
Total loans:      
Individually evaluated for impairment 96,862 123,406 210,199
Individually evaluated for impairment 2,786,254 2,660,420 2,544,495
Total Loans 2,883,116 2,783,826 2,754,694
Consumer
     
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 7,141 8,594 9,332
Provision charged to operating expense 1,605 1,922 3,566
Less loans charged-off (4,612) (5,320) (6,043)
Add back recoveries of loans previously charged-off 2,059 1,945 1,739
Ending balance 6,193 7,141 8,594
Allowance for loan losses:      
Loans individually evaluated for impairment 0 0 0
Loans collectively evaluated for impairment 6,193 7,141 8,594
Ending balance 6,193 7,141 8,594
Total loans:      
Individually evaluated for impairment 0 0 0
Individually evaluated for impairment 671,587 636,794 616,071
Total Loans 671,587 636,794 616,071
Commercial
     
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 17,085 15,325 25,354
Provision charged to operating expense 41 10,845 7,959
Less loans charged-off (5,672) (11,990) (19,332)
Add back recoveries of loans previously charged-off 3,293 2,905 1,344
Ending balance 14,747 17,085 15,325
Allowance for loan losses:      
Loans individually evaluated for impairment 1,504 1,919 4,664
Loans collectively evaluated for impairment 13,243 15,166 10,661
Ending balance 14,747 17,085 15,325
Total loans:      
Individually evaluated for impairment 13,585 12,242 19,638
Individually evaluated for impairment 662,959 676,511 673,623
Total Loans 676,544 688,753 693,261
Agriculture
     
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 503 1,266 1,613
Provision charged to operating expense (49) (668) (218)
Less loans charged-off (5) (120) (142)
Add back recoveries of loans previously charged-off 27 25 13
Ending balance 476 503 1,266
Allowance for loan losses:      
Loans individually evaluated for impairment 86 28 151
Loans collectively evaluated for impairment 390 475 1,115
Ending balance 476 503 1,266
Total loans:      
Individually evaluated for impairment 125 537 759
Individually evaluated for impairment 111,747 113,090 118,951
Total Loans 111,872 113,627 119,710
Other
     
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 0 0 0
Provision charged to operating expense 0 0 0
Less loans charged-off 0 0 0
Add back recoveries of loans previously charged-off 0 0 0
Ending balance 0 0 0
Allowance for loan losses:      
Loans individually evaluated for impairment 0 0 0
Loans collectively evaluated for impairment 0 0 0
Ending balance 0 0 0
Total loans:      
Individually evaluated for impairment 0 0 0
Individually evaluated for impairment 1,734 912 2,813
Total Loans $ 1,734 $ 912 $ 2,813