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Condensed Financial Statements of Parent Company (Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]                      
Interest income $ 172,026 $ 167,826 $ 159,910 $ 150,410 $ 153,185 $ 147,643 $ 138,533 $ 132,743 $ 650,172 $ 572,104 $ 421,934
Interest expense (50,133) (44,679) (37,091) (30,342) (26,793) (24,380) (21,713) (17,838) (162,245) (90,724) (58,579)
Income tax provision (16,069) (15,461) (16,629) (17,733) (48,231) (27,708) (25,451) (22,999) (65,892) (124,389) (77,452)
NET INCOME $ 44,449 $ 46,378 $ 47,530 $ 51,232 $ 17,984 $ 44,564 $ 40,687 $ 36,210 189,589 139,445 113,747
Other comprehensive loss                 (11,205) (3,527) (12,825)
Comprehensive income                 178,384 135,918 100,922
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Interest income                 0 0 0
Interest expense                 (12,153) (5,089) (2,927)
Noninterest income                 525 0 0
Other operating expense                 (4,855) (5,988) (9,826)
Equity in earnings of bank subsidiary                 201,162 146,397 121,996
Income before income tax benefit                 184,679 135,320 109,243
Income tax provision                 4,910 4,125 4,504
NET INCOME                 189,589 139,445 113,747
Other comprehensive loss                 (11,205) (3,527) (12,825)
Comprehensive income                 $ 178,384 $ 135,918 $ 100,922