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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Book values and approximate fair values of investment securities      
Service charges on deposit accounts $ 12,690 $ 11,862 $ 10,571
Interchange income 14,606 11,454 9,582
Other fees 5,339 3,156 2,331
Fees from presold mortgage loans [1] 2,735 5,695 2,033
Commissions from sales of insurance and financial products:      
Insurance income 6,038 3,148 1,763
Wealth management income 2,693 2,152 2,027
SBA consulting fees 4,675 4,024 3,199
SBA loan sale gains [1] 10,366 5,479 1,433
Bank-owned life insurance income 2,534 2,321 2,052
Foreclosed property gains (losses), net (565) (531) (625)
FDIC indemnification asset income (expense), net [1] (10,255)
Securities gains (losses), net [1] (235) 3
Gain on branch sale [1] 1,466
Other gains (losses), net [1] 723 383 (29)
Total noninterest income $ 61,834 $ 48,908 $ 25,551
[1] Not within the scope of ASC 606.