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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM $ 1,184,497 $ 555,070
Unrealized Losses, AFS and HTM 14,342 2,348
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 158,402 7,003
Unrealized Losses, AFS and HTM 3,048 332
Total    
Fair Value, AFS and HTM 1,342,899 562,073
Unrealized Losses, AFS and HTM 17,390 2,680
Government-sponsored enterprise securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 49,238 29,812
Unrealized Losses, AFS 776 181
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 19,370 0
Unrealized Losses, AFS 630 0
Total    
Fair Value, AFS 68,608 29,812
Unrealized Losses, AFS 1,406 181
Mortgage-backed securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM 1,010,196 497,992
Unrealized Losses, AFS and HTM 12,219 1,957
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 124,643 6,168
Unrealized Losses, AFS and HTM 2,064 167
Total    
Fair Value, AFS and HTM 1,134,839 504,160
Unrealized Losses, AFS and HTM 14,283 2,124
Corporate bonds    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 0 3,956
Unrealized Losses, AFS 0 45
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 4,871 835
Unrealized Losses, AFS 129 165
Total    
Fair Value, AFS 4,871 4,791
Unrealized Losses, AFS 129 210
State and local governments    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, HTM 125,063 23,310
Unrealized Losses, HTM 1,347 165
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, HTM 9,518 0
Unrealized Losses, HTM 225 0
Total    
Fair Value, HTM 134,581 23,310
Unrealized Losses, HTM $ 1,572 $ 165