Fair Value (Carrying Amounts And Estimated Fair Values Of Financial Instruments, Not Previously Presented) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	$ 402,828	$ 484,590
Federal Home Loan Bank stock	37,927	30,835
Covered loans	372,333	626,360
FDIC Indemnification Asset	115,738	167,714
Accrued interest receivable	46,979	44,801
Net loans	5,141,831	4,709,143
Noninterest-bearing demand deposits	2,007,770	1,728,546
Time deposits	1,281,281	1,447,664
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	56,612	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	169,282	216,345
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	2,998	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	264,060	222,872
Federal Home Loan Bank stock	37,927	30,835
Commercial	1,377,817	1,321,445
Commercial real estate	1,407,420	1,366,311
Residential real estate	1,356,922	1,038,280
Consumer credit	999,672	983,107
FDIC Indemnification Asset	115,738	167,714
Accrued interest receivable	46,979	44,801
Noninterest-bearing demand deposits	2,007,770	1,728,546
NOW, savings and money market deposits	3,989,902	3,435,353
Time deposits	1,281,281	1,447,664
Federal Funds Purchased		103,010
Repurchase agreements, short term		321,725
Repurchase agreements	50,000	50,000
Other Short-term Borrowings		114
Junior subordinated debenture		16,000
Subordinated notes		13,000
Federal Home Loan Bank Advances		208,360
Capital lease obligation		4,261
Standby letters of credit		431
Accrued interest payable		5,239
Off-Balance Sheet Financial Instruments	0	0
Carrying Value [Member] | Federal Funds Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Purchased	231,688
Repurchase agreements	358,127
Carrying Value [Member] | Junior Subordinated Debenture [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debenture	28,000
Carrying Value [Member] | Federal Home Loan Bank Advances [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank Advances	155,323
Carrying Value [Member] | Capital Lease Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligation	4,211
Carrying Value [Member] | Accrued Interest Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued interest payable	3,308
Carrying Value [Member] | Standby Letters of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Standby letters of credit	357
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	173,936	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	56,612	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	169,282	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	2,998	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		162,226
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	264,060
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	43
Noninterest-bearing demand deposits	2,007,770
NOW, savings and money market deposits	3,989,902
Time deposits	0
Repurchase agreements	0
Off-Balance Sheet Financial Instruments	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Federal Funds Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Purchased	231,688
Repurchase agreements	358,123
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Junior Subordinated Debenture [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debenture	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Federal Home Loan Bank Advances [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank Advances	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Capital Lease Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligation	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Accrued Interest Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued interest payable	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Standby Letters of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Standby letters of credit	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	37,927
Commercial	0
Commercial real estate	0
Residential real estate	0
Consumer credit	0
FDIC Indemnification Asset	0
Accrued interest receivable	20,701
Noninterest-bearing demand deposits	0
NOW, savings and money market deposits	0
Time deposits	1,308,111
Repurchase agreements	53,422
Off-Balance Sheet Financial Instruments	0
Significant Other Observable Inputs (Level 2) [Member] | Federal Funds Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Purchased	0
Repurchase agreements	0
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debenture [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debenture	16,255
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank Advances	0
Significant Other Observable Inputs (Level 2) [Member] | Capital Lease Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligation	5,657
Significant Other Observable Inputs (Level 2) [Member] | Accrued Interest Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued interest payable	3,308
Significant Other Observable Inputs (Level 2) [Member] | Standby Letters of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Standby letters of credit	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	188,263
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	58,919
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	183,021
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	2,998
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	1,424,103
Commercial real estate	1,475,066
Residential real estate	1,458,672
Consumer credit	1,030,990
FDIC Indemnification Asset	106,090
Accrued interest receivable	26,235
Noninterest-bearing demand deposits	0
NOW, savings and money market deposits	0
Time deposits	0
Repurchase agreements	0
Off-Balance Sheet Financial Instruments	2,305
Significant Unobservable Inputs (Level 3) [Member] | Federal Funds Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Purchased	0
Repurchase agreements	0
Significant Unobservable Inputs (Level 3) [Member] | Junior Subordinated Debenture [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debenture	0
Significant Unobservable Inputs (Level 3) [Member] | Federal Home Loan Bank Advances [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank Advances	170,664
Significant Unobservable Inputs (Level 3) [Member] | Capital Lease Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligation	0
Significant Unobservable Inputs (Level 3) [Member] | Accrued Interest Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued interest payable	0
Significant Unobservable Inputs (Level 3) [Member] | Standby Letters of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Standby letters of credit	357
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