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Fair Value Measurements (Other Assumptions) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits    
Carrying amount of time deposits $ 2,055,093 $ 2,012,300
Significant Unobservable Inputs (Level 3)    
Loans    
Carrying amount of fixed rate performing loans 1,454,099 1,503,811
Estimated fair value of fixed rate performing loans 1,379,125 1,481,239
Deposits    
Carrying amount of time deposits 2,055,093 2,012,300
Estimated fair value of time deposits 2,047,202 2,011,950
Significant Other Observable Inputs (Level 2)    
Other borrowed funds    
Carrying amount of the long-term FHLB borrowings 436,465 436,511
Estimated fair value of long-term FHLB borrowings $ 498,716 $ 465,017