Fair Value (Carrying Amounts And Estimated Fair Values Of Financial Instruments, Not Previously Presented) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	$ 463,935	$ 484,590	$ 567,708
Federal Home Loan Bank stock	30,835	30,835	19,673
Commercial	1,205,532	1,216,654	1,269,607
Commercial real estate	1,042,581	1,067,370	1,170,401
Residential real estate	1,122,800	995,458	795,442
Consumer credit	855,386	861,361	881,891
Covered loans	489,331	626,360	0
FDIC Indemnification Asset	127,717	147,566	0
Accrued interest receivable	44,163	44,801	42,600
Net loans	4,660,870	4,709,143	4,047,152
Noninterest-bearing demand deposits	1,847,904	1,728,546	1,504,632
Time deposits	1,251,831	1,447,664	1,557,978
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	69,537	84,075
States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	215,836	216,345
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	2,994	7,011
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold and money market investments	263,046	222,872
Federal Home Loan Bank stock	30,835	30,835
Commercial	1,263,607	1,321,445
Commercial real estate	1,275,680	1,366,311
Residential real estate	1,158,519	1,038,280
Consumer credit	963,064	983,107
FDIC Indemnification Asset	127,717	147,566
Accrued interest receivable	44,163	44,801
Noninterest-bearing demand deposits	1,847,904	1,728,546
NOW, savings and money market deposits	3,570,538	3,435,353
Time deposits	1,251,831	1,447,664
Federal Funds Purchased	919	103,010
Repurchase agreements, short term	345,081	321,725
Repurchase agreements	50,000	50,000
Other Short-term Borrowings		114
Junior subordinated debenture	13,000	16,000
Subordinated notes		13,000
Federal Home Loan Bank Advances	207,312	208,360
Capital lease obligation	4,236	4,261
Standby letters of credit	409	431
Accrued interest payable	3,919	5,239
Off-Balance Sheet Financial Instruments	0	0
Carrying Value [Member] | U.S. Government-Sponsored Entities And Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	175,568	177,159
Carrying Value [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	69,537	84,075
Carrying Value [Member] | States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	215,836	216,345
Carrying Value [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	2,994	7,011
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold and money market investments		222,872
Federal Home Loan Bank stock		30,835
Commercial		1,366,316
Commercial real estate		1,421,941
Residential real estate		1,124,222
Consumer credit		1,014,807
FDIC Indemnification Asset		142,078
Accrued interest receivable		44,801
Noninterest-bearing demand deposits		1,728,546
NOW, savings and money market deposits		3,435,353
Time deposits		1,481,854
Federal Funds Purchased		103,010
Repurchase agreements, short term		321,722
Repurchase agreements		54,484
Other Short-term Borrowings		114
Junior subordinated debenture		12,697
Subordinated notes		12,999
Federal Home Loan Bank Advances		225,711
Capital lease obligation		5,079
Standby letters of credit		431
Accrued interest payable		5,239
Off-Balance Sheet Financial Instruments		1,720
Fair Value [Member] | U.S. Government-Sponsored Entities And Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity		188,593
Fair Value [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity		87,380
Fair Value [Member] | States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity		224,717
Fair Value [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity		7,009
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold and money market investments	263,046
Federal Home Loan Bank stock	0
Commercial	0
Commercial real estate	0
Residential real estate	0
Consumer credit	0
FDIC Indemnification Asset	0
Accrued interest receivable	21
Noninterest-bearing demand deposits	1,847,904
NOW, savings and money market deposits	3,570,538
Time deposits	0
Federal Funds Purchased	919
Repurchase agreements, short term	345,081
Repurchase agreements	0
Junior subordinated debenture	0
Federal Home Loan Bank Advances	0
Capital lease obligation	0
Standby letters of credit	0
Accrued interest payable	0
Off-Balance Sheet Financial Instruments	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | U.S. Government-Sponsored Entities And Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold and money market investments	0
Federal Home Loan Bank stock	30,835
Commercial	0
Commercial real estate	0
Residential real estate	0
Consumer credit	0
FDIC Indemnification Asset	0
Accrued interest receivable	20,148
Noninterest-bearing demand deposits	0
NOW, savings and money market deposits	0
Time deposits	1,281,957
Federal Funds Purchased	0
Repurchase agreements, short term	0
Repurchase agreements	54,031
Junior subordinated debenture	7,429
Federal Home Loan Bank Advances	0
Capital lease obligation	5,285
Standby letters of credit	0
Accrued interest payable	3,919
Off-Balance Sheet Financial Instruments	0
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government-Sponsored Entities And Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	187,230
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	72,334
Significant Other Observable Inputs (Level 2) [Member] | States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	231,146
Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	2,994
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold and money market investments	0
Federal Home Loan Bank stock	0
Commercial	1,306,848
Commercial real estate	1,329,108
Residential real estate	1,247,048
Consumer credit	999,676
FDIC Indemnification Asset	103,654
Accrued interest receivable	23,724
Noninterest-bearing demand deposits	0
NOW, savings and money market deposits	0
Time deposits	0
Federal Funds Purchased	0
Repurchase agreements, short term	0
Repurchase agreements	0
Junior subordinated debenture	0
Federal Home Loan Bank Advances	207,312
Capital lease obligation	0
Standby letters of credit	409
Accrued interest payable	0
Off-Balance Sheet Financial Instruments	1,712
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government-Sponsored Entities And Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Significant Unobservable Inputs (Level 3) [Member] | States And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	0
Significant Unobservable Inputs (Level 3) [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, held-to-maturity	$ 0