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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 44,299 $ 46,120
Derivative liabilities 31,619 36,259
Total recurring fair value measurements - liabilities 1,100 1,300
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 5,976,386 5,961,917
Mortgage loans held for sale 36,477 33,158
Derivative assets [1] 55,683 63,126
Total fair value measurements 6,068,546 6,058,201
Derivative liabilities [1] 91,143 95,367
Total recurring fair value measurements - liabilities 91,143 95,367
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 282,467 269,332
Recurring [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 180,143 191,328
Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 16,237 16,357
Recurring [Member] | Residential Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,333,405 2,375,629
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3,140,320 3,083,325
Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 23,814 25,946
Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 5,976,386 5,961,917
Mortgage loans held for sale 36,477 33,158
Derivative assets [1] 55,683 63,126
Total fair value measurements 6,068,546 6,058,201
Derivative liabilities [1] 90,061 94,083
Total recurring fair value measurements - liabilities 90,061 94,083
Recurring [Member] | Level 2 [Member] | U.S. Treasury And Government Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 282,467 269,332
Recurring [Member] | Level 2 [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 180,143 191,328
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 16,237 16,357
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,333,405 2,375,629
Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3,140,320 3,083,325
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 23,814 25,946
Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities [1] 1,082 1,284
Total recurring fair value measurements - liabilities $ 1,082 $ 1,284
[1] For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.