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Fair Value Measurements (Other Assumptions) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deposits    
Carrying amount of time deposits $ 1,981,369 $ 1,973,468
Significant Unobservable Inputs (Level 3)    
Loans    
Carrying amount of fixed rate performing loans 1,522,399 1,515,437
Estimated fair value of fixed rate performing loans 1,503,049 1,469,231
Deposits    
Carrying amount of time deposits 1,981,369 1,973,468
Estimated fair value of time deposits 1,981,073 1,976,156
Significant Other Observable Inputs (Level 2)    
Other borrowed funds    
Carrying amount of the long-term FHLB borrowings 436,556 436,690
Estimated fair value of long-term FHLB borrowings $ 463,409 $ 436,238