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Fair Value Measurement (Recurring and Nonrecurring Table) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2014
Recurring Fair Value Measurements                
Available-for-sale $ 4,318,688 $ 3,838,509 $ 4,318,688 $ 3,838,509 $ 3,967,735      
Residential loans held for sale 3,962 5,432 3,962 5,432 5,472      
Derivative Asset, Fair Value, Gross Asset 117,842 48,073 117,842 48,073 58,107      
Total Assets, Fair Value Disclosure, Recurring 4,440,492 3,892,014 4,440,492 3,892,014 4,031,314      
Derivative Liability, Fair Value, Gross Liability 90,622 51,497 90,622 51,497 52,745      
True Up Liability 16,170 13,408 16,170 13,408 14,750      
Total liabilities at fair value on a recurring basis 106,792 64,905 106,792 64,905 67,495      
Nonrecurring Fair Value Measurements [Abstract]                
Fair Value of Mortgage Servicing Rights 15,954 20,809 15,954 20,809 19,149      
Impaired and Non Accrual Loans Fair Value Disclosure 104,208 72,580 104,208 72,580 71,428      
Other Real Estate, Non Covered 10,027 33,078 10,027 33,078 18,576      
Other Real Estate Covered by Loss Share 4 4 4 4 365      
Nonrecurring Fair Value 130,193 126,471 130,193 126,471 109,518      
Mortgage Servicing Rights 17,310 20,635 17,310 20,635 18,938 $ 18,127 $ 21,490 $ 22,011
Mortgage Servicing rights Valuation Allowance (1,549) (490) (1,549) (490) (399) $ (868) $ (1,131) $ (955)
Mortgage Servicing Rights Net Carrying balance 15,761 20,145 15,761 20,145 18,500      
Mortgage Servicing Rights (MSR) Impairment (Recovery) (681) 641 (1,150) 465 600      
Impairment of Noncovered Other Real Estate Owned   2,100     4,500      
Impairment of Covered Other Real Esate Owned   200     600      
Impaired Collateral Dependant Loans, Recorded Investment 116,100 82,700 116,100 82,700 84,300      
Determination Of Specific Allowance For Loan Losses (11,900) (10,200) (11,900) (10,200) (12,900)      
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount 104,200 72,600 104,200 72,600 71,400      
Foreclosed Real Estate Expense 700              
Level 1                
Recurring Fair Value Measurements                
Available-for-sale 2,788 2,824 2,788 2,824 2,821      
Residential loans held for sale 0 0 0 0 0      
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Total Assets, Fair Value Disclosure, Recurring 2,788 2,824 2,788 2,824 2,821      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
True Up Liability 0 0 0 0 0      
Total liabilities at fair value on a recurring basis 0 0 0 0 0      
Nonrecurring Fair Value Measurements [Abstract]                
Fair Value of Mortgage Servicing Rights 0 0 0 0 0      
Impaired and Non Accrual Loans Fair Value Disclosure 0 0 0 0 0      
Other Real Estate, Non Covered 0 0 0 0 0      
Other Real Estate Covered by Loss Share 0 0 0 0 0      
Nonrecurring Fair Value 0 0 0 0 0      
Level 2                
Recurring Fair Value Measurements                
Available-for-sale 3,972,996 3,524,149 3,972,996 3,524,149 3,623,270      
Residential loans held for sale 3,962 5,432 3,962 5,432 5,472      
Derivative Asset, Fair Value, Gross Asset 117,842 48,073 117,842 48,073 58,107      
Total Assets, Fair Value Disclosure, Recurring 4,094,800 3,577,654 4,094,800 3,577,654 3,686,849      
Derivative Liability, Fair Value, Gross Liability 90,622 51,497 90,622 51,497 52,745      
True Up Liability 0 0 0 0 0      
Total liabilities at fair value on a recurring basis 90,622 51,497 90,622 51,497 52,745      
Nonrecurring Fair Value Measurements [Abstract]                
Fair Value of Mortgage Servicing Rights 0 0 0 0 0      
Impaired and Non Accrual Loans Fair Value Disclosure 0 0 0 0 0      
Other Real Estate, Non Covered 0 0 0 0 0      
Other Real Estate Covered by Loss Share 0 0 0 0 0      
Nonrecurring Fair Value 0 0 0 0 0      
Level 3                
Recurring Fair Value Measurements                
Available-for-sale 342,904 311,536 342,904 311,536 341,644      
Residential loans held for sale 0 0 0 0 0      
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Total Assets, Fair Value Disclosure, Recurring 342,904 311,536 342,904 311,536 341,644      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
True Up Liability 16,170 13,408 16,170 13,408 14,750      
Total liabilities at fair value on a recurring basis 16,170 13,408 16,170 13,408 14,750      
Nonrecurring Fair Value Measurements [Abstract]                
Fair Value of Mortgage Servicing Rights 15,954 20,809 15,954 20,809 19,149      
Impaired and Non Accrual Loans Fair Value Disclosure 104,208 72,580 104,208 72,580 71,428      
Other Real Estate, Non Covered 10,027 33,078 10,027 33,078 18,576      
Other Real Estate Covered by Loss Share 4 4 4 4 365      
Nonrecurring Fair Value 130,193 126,471 130,193 126,471 109,518      
US Treasury Securities                
Recurring Fair Value Measurements                
Available-for-sale 4,997 5,005 4,997 5,005 5,000      
US Treasury Securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
US Treasury Securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 4,997   4,997          
US Treasury Securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
Equity Securities                
Recurring Fair Value Measurements                
Available-for-sale 2,788 2,824 2,788 2,824 2,821      
Equity Securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale   2,824   2,824 2,821      
Equity Securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   0   0 0      
Equity Securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale   0   0 0      
US Government Agency Debentures                
Recurring Fair Value Measurements                
Available-for-sale   2,510   2,510        
US Government Agency Debentures | Level 1                
Recurring Fair Value Measurements                
Available-for-sale   0   0        
US Government Agency Debentures | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   2,510   2,510        
US Government Agency Debentures | Level 3                
Recurring Fair Value Measurements                
Available-for-sale   0   0        
Non-marketable Equity Securities                
Recurring Fair Value Measurements                
Available-for-sale   5,005   5,005 5,000      
Non-marketable Equity Securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale   0   0 0      
Non-marketable Equity Securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   5,005   5,005 5,000      
Non-marketable Equity Securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale   0   0 0      
Marketable Equity Securities                
Recurring Fair Value Measurements                
Available-for-sale 2,788 2,824 2,788 2,824 2,821      
Marketable Equity Securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 2,788   2,788          
Marketable Equity Securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
Marketable Equity Securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
US Government Agencies Debt Securities                
Recurring Fair Value Measurements                
Available-for-sale 2,528 2,510 2,528 2,510 2,498      
US Government Agencies Debt Securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
US Government Agencies Debt Securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 2,528   2,528   2,498      
US Government Agencies Debt Securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0   0          
U.S. States and political subdivisions debt securities                
Recurring Fair Value Measurements                
Available-for-sale 151,547 207,617 151,547 207,617 192,795      
U.S. States and political subdivisions debt securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
U.S. States and political subdivisions debt securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 151,547 207,617 151,547 207,617 192,795      
U.S. States and political subdivisions debt securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises                
Recurring Fair Value Measurements                
Available-for-sale 860,247 960,852 860,247 960,852 906,229      
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   960,852   960,852 906,229      
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises                
Recurring Fair Value Measurements                
Available-for-sale 202,048 170,338 202,048 170,338 172,109      
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   170,338   170,338 172,109      
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises                
Recurring Fair Value Measurements                
Available-for-sale 2,353,018 1,949,389 2,353,018 1,949,389 2,128,320      
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   1,949,389   1,949,389 2,128,320      
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency                
Recurring Fair Value Measurements                
Available-for-sale 3 5 3 5 4      
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 3 5 3 5 4      
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises                
Recurring Fair Value Measurements                
Available-for-sale 398,611 228,438 398,611 228,438 216,319      
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2                
Recurring Fair Value Measurements                
Available-for-sale   228,438   228,438 216,319      
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Corporate debt securities                
Recurring Fair Value Measurements                
Available-for-sale 51,107 53,450 51,107 53,450 52,229      
Corporate debt securities | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Corporate debt securities | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Corporate debt securities | Level 3                
Recurring Fair Value Measurements                
Available-for-sale   53,450   53,450 52,229      
Collateralized Loan Obligations                
Recurring Fair Value Measurements                
Available-for-sale 291,794 258,081 291,794 258,081 289,411      
Collateralized Loan Obligations | Level 1                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Collateralized Loan Obligations | Level 2                
Recurring Fair Value Measurements                
Available-for-sale 0 0 0 0 0      
Collateralized Loan Obligations | Level 3                
Recurring Fair Value Measurements                
Available-for-sale 291,794 258,081 291,794 258,081 289,411      
Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 88,082 46,920 88,082 46,920 49,368      
Derivative Liability, Fair Value, Gross Liability 87,850 46,393 87,850 46,393 49,209      
Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0   0          
Interest Rate Swap | Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 29,760 1,153 29,760 1,153 8,739      
Derivative Liability, Fair Value, Gross Liability 2,772 5,104 2,772 5,104 3,536      
Interest Rate Swap | Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Interest Rate Swap | Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 29,760 1,153 29,760 1,153 8,739      
Derivative Liability, Fair Value, Gross Liability 2,772 5,104 2,772 5,104 3,536      
Interest Rate Swap | Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Interest Rate Swap | Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 87,575 46,216 87,575 46,216 48,920      
Derivative Liability, Fair Value, Gross Liability 87,575 46,216 87,575 46,216 48,920      
Interest Rate Swap | Not Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Interest Rate Swap | Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 87,575 46,216 87,575 46,216 48,920      
Derivative Liability, Fair Value, Gross Liability 87,575 46,216 87,575 46,216 48,920      
Interest Rate Swap | Not Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Mortgage Loan Commitments | Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 253 342 253 342 149      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 253 342 253 342 149      
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Forward sales contracts | Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset   106   106 0      
Derivative Liability, Fair Value, Gross Liability 61 0 61 0 5      
Forward sales contracts | Not Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset   0   0        
Derivative Liability, Fair Value, Gross Liability 0   0   0      
Forward sales contracts | Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset   106   106        
Derivative Liability, Fair Value, Gross Liability 61   61   5      
Forward sales contracts | Not Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset   0   0        
Derivative Liability, Fair Value, Gross Liability 0   0   0      
Credit Risk Contract | Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 7 0 7 0 0      
Credit Risk Contract | Not Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Liability, Fair Value, Gross Liability 0   0          
Credit Risk Contract | Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Liability, Fair Value, Gross Liability 7   7          
Credit Risk Contract | Not Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Liability, Fair Value, Gross Liability 0   0          
Foreign Exchange | Not Designated as Hedging Instrument                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 254 256 254 256 299      
Derivative Liability, Fair Value, Gross Liability 207 177 207 177 284      
Foreign Exchange | Not Designated as Hedging Instrument | Level 1                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability 0 0 0 0 0      
Foreign Exchange | Not Designated as Hedging Instrument | Level 2                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 254 256 254 256 299      
Derivative Liability, Fair Value, Gross Liability 207 177 207 177 284      
Foreign Exchange | Not Designated as Hedging Instrument | Level 3                
Recurring Fair Value Measurements                
Derivative Asset, Fair Value, Gross Asset 0 0 0 0 0      
Derivative Liability, Fair Value, Gross Liability $ 0 $ 0 $ 0 $ 0 $ 0