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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]                      
Interest income $ 165,773 $ 172,417 $ 173,466 $ 173,130 $ 172,026 $ 167,826 $ 159,910 $ 150,410 $ 684,786 $ 650,172 $ 572,104
Interest expense (52,265) (56,159) (56,245) (53,522) (50,133) (44,679) (37,091) (30,342) (218,191) (162,245) (90,724)
Noninterest income 12,979 12,995 12,287 11,422 11,614 13,447 15,269 19,850 49,683 60,180 66,415
Noninterest expense 70,429 69,995 71,371 70,833 70,189 67,455 71,629 68,453 282,628 277,726 266,601
Income tax benefit (12,049) (14,566) (14,256) (14,439) (16,069) (15,461) (16,629) (17,733) (55,310) (65,892) (124,389)
NET INCOME $ 43,009 $ 42,592 $ 42,681 $ 42,758 $ 44,449 $ 46,378 $ 47,530 $ 51,232 171,040 189,589 139,445
Other comprehensive income (loss), net of tax                 41,854 (11,205) (3,527)
Comprehensive income                 212,894 178,384 135,918
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Interest income                 0 0 0
Interest expense                 (16,001) (12,152) (5,089)
Noninterest income                 175 525 0
Noninterest expense                 4,386 4,855 5,988
Dividend from subsidiary, net                 120,000 10,000 70,000
Equity in undistributed earnings of subsidiary                 65,713 191,161 76,397
Income before income tax benefit                 165,501 184,679 135,320
Income tax benefit                 5,539 4,910 4,125
NET INCOME                 171,040 189,589 139,445
Other comprehensive income (loss), net of tax                 41,854 (11,205) (3,527)
Comprehensive income                 $ 212,894 $ 178,384 $ 135,918