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Fair Values Of Assets And Liabilities (Summary Of Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities $ 1,781,883 $ 1,796,076 $ 1,256,768
Trading account securities 259 583 635
Derivative assets 41,945 47,546 50,349
Derivative liabilities 38,804 53,755 58,008
US Treasury Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 210,902 219,487 25,256
U.S. Government Agencies Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 912,689 990,039 628,184
Municipal Bonds [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 150,647 110,471 99,384
Asset-backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 319,193 271,574 306,238
Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 49,271 49,699 40,717
Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 259 583 635
Mortgage loans held-for-sale 329,186 385,033 548,300
Mortgage servicing rights 8,608 6,750 6,276
Nonqualified deferred compensation assets 6,801 5,532 5,438
Derivative assets 57,573 53,906 65,990
Total 2,184,310 2,247,880 1,883,407
Derivative liabilities 49,300 57,751 79,977
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 210,902 219,487 25,256
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 912,689 990,039 628,184
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 150,647 110,471 99,384
Fair Value, Measurements, Recurring [Member] | Corporate Notes And Other [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 139,181 154,806 156,989
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 319,193 271,574 306,238
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 49,271 49,699 40,717
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities         
Mortgage loans held-for-sale         
Mortgage servicing rights         
Nonqualified deferred compensation assets         
Derivative assets         
Total         
Derivative liabilities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government Agencies Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Notes And Other [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities         
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 259 583 635
Mortgage loans held-for-sale 329,186 385,033 548,300
Mortgage servicing rights 0 0 0
Nonqualified deferred compensation assets 6,801 5,532 5,438
Derivative assets 57,573 53,906 65,990
Total 2,122,572 2,188,191 1,819,121
Derivative liabilities 49,300 57,751 79,977
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 210,902 219,487 25,256
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Agencies Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 912,689 990,039 628,184
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 117,959 79,701 63,629
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Notes And Other [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 139,181 154,806 156,989
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 319,193 271,574 306,238
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 28,829 27,530 18,462
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 0 0 0
Mortgage loans held-for-sale 0 0 0
Mortgage servicing rights 8,608 6,750 6,276
Nonqualified deferred compensation assets 0 0 0
Derivative assets 0 0 0
Total 61,738 59,689 64,286
Derivative liabilities 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government Agencies Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 32,688 30,770 35,755
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate Notes And Other [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities $ 20,442 $ 22,169 $ 22,255