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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,074,116 $ 1,524,106 $ 1,978,827 $ 1,395,321
Amounts reclassified from accumulated other comprehensive income/(loss) 355 537 1,343 1,463
Total other comprehensive (loss) gain 5,809 (6,521) 47,793 (27,315)
Ending Balance 2,101,269 1,927,269 2,101,269 1,927,269
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (16,542) (18,626)
Other comprehensive income/(loss) before reclassifications     0  
Acquired FFKT Medical benefit plan       4,235
Amounts reclassified from accumulated other comprehensive income/(loss) 592 595 1,721 1,621
Total other comprehensive (loss) gain     1,721 5,856
Ending Balance (14,821) (12,770) (14,821) (12,770)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (21,522) (13,250)
Other comprehensive income/(loss) before reclassifications     46,450 (33,013)
Amounts reclassified from accumulated other comprehensive income/(loss) (169) (9) (199) (9)
Total other comprehensive (loss) gain     46,251 (33,022)
Adoption of Accounting Standard ASU 2016-01   (1,063)   (1,063)
Ending Balance 24,729 (47,335) 24,729 (47,335)
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     193 381
Other comprehensive income/(loss) before reclassifications     0  
Amounts reclassified from accumulated other comprehensive income/(loss) (68) (49) (179) (149)
Total other comprehensive (loss) gain     (179) (149)
Ending Balance 14 232 14 232
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 4,113 (53,352) (37,871) (31,495)
Other comprehensive income/(loss) before reclassifications     46,450 (33,013)
Acquired FFKT Medical benefit plan       4,235
Amounts reclassified from accumulated other comprehensive income/(loss)     1,343 1,463
Total other comprehensive (loss) gain 5,809 (6,521) 47,793 (27,315)
Adoption of Accounting Standard ASU 2016-01   (1,063)   (1,063)
Ending Balance $ 9,922 $ (59,873) $ 9,922 $ (59,873)