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Recent Accounting Pronouncements - Schedule of Composition of Loans and Impact of Adoption (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets              
Loans $ 13,615,701   $ 12,117,524 $ 12,117,524      
Allowance (128,394) [1] $ (106,380) (54,619) (54,619) [1] $ (56,292) $ (55,559) $ (55,461)
Net loans 13,487,307   12,062,905 12,062,905      
Net deferred tax assets     29,705        
Liabilities              
Allowance for credit losses on unfunded loan commitments 11,026 8,950 2,656 2,656      
Shareholders' equity:              
Retained earnings 678,378   682,185 682,185      
Impact of ASC 326 Adoption              
Assets              
Loans     4,478        
Allowance   0 (41,347)        
Net loans     (36,869)        
Net deferred tax assets     10,268        
Liabilities              
Allowance for credit losses on unfunded loan commitments     4,549 4,549      
Shareholders' equity:              
Retained earnings     (31,150)        
Adjusted Balance              
Assets              
Loans 13,615,701   12,122,002        
Allowance (128,394) (106,380) (95,966)        
Net loans 13,487,307   12,026,036        
Net deferred tax assets     39,973        
Liabilities              
Allowance for credit losses on unfunded loan commitments     7,205 7,205      
Shareholders' equity:              
Retained earnings     651,035        
Commercial              
Assets              
Loans 4,307,505   2,815,154 2,890,296      
Allowance (29,618) (31,125) (21,359) (22,585) (22,548) (20,406) (21,742)
Commercial | Impact of ASC 326 Adoption              
Assets              
Loans     2,679        
Allowance   0 (7,150)        
Commercial | Adjusted Balance              
Assets              
Loans 4,113,644   2,817,833        
Allowance   (31,125) (28,509)        
Commercial real estate              
Assets              
Loans 5,403,316   4,889,253 5,166,792      
Allowance (71,069) (54,103) (20,535) (21,588) (23,311) (25,169) (23,470)
Commercial real estate | Impact of ASC 326 Adoption              
Assets              
Loans     1,637        
Allowance   0 (25,548)        
Commercial real estate | Adjusted Balance              
Assets              
Loans 5,236,947   4,890,890        
Allowance   (54,103) (46,083)        
BBCC              
Assets              
Loans     352,681        
Allowance (6,332) (5,417) (2,279)        
BBCC | Impact of ASC 326 Adoption              
Assets              
Loans     33        
Allowance   0 (3,702)        
BBCC | Adjusted Balance              
Assets              
Loans 360,230   352,714        
Allowance   (5,417) (5,981)        
Residential real estate              
Assets              
Loans 2,229,298   2,334,289 2,334,289      
Allowance (14,244) (9,637) (2,299) (2,299) (2,269) (2,302) (2,277)
Residential real estate | Impact of ASC 326 Adoption              
Assets              
Loans     105        
Allowance   0 (6,986)        
Residential real estate | Adjusted Balance              
Assets              
Loans 2,229,298   2,334,394        
Allowance   (9,637) (9,285)        
Consumer              
Assets              
Loans 1,675,582     1,726,147      
Allowance       $ (8,147) $ (8,164) $ (7,682) $ (7,972)
Indirect              
Assets              
Loans 933,723   935,584        
Allowance (4,453) (3,666) (5,319)        
Indirect | Impact of ASC 326 Adoption              
Assets              
Loans     10        
Allowance   0 1,669        
Indirect | Adjusted Balance              
Assets              
Loans 933,723   935,594        
Allowance   (3,666) (3,650)        
Direct              
Assets              
Loans 194,573   228,524        
Allowance (835) (822) (1,863)        
Direct | Impact of ASC 326 Adoption              
Assets              
Loans     2        
Allowance   0 1,059        
Direct | Adjusted Balance              
Assets              
Loans 194,573   228,526        
Allowance   (822) (804)        
Home equity              
Assets              
Loans 547,286   562,039        
Allowance (1,843) (1,610) (965)        
Home equity | Impact of ASC 326 Adoption              
Assets              
Loans     12        
Allowance   0 (689)        
Home equity | Adjusted Balance              
Assets              
Loans 547,286   562,051        
Allowance   $ (1,610) (1,654)        
Previously Reported              
Assets              
Loans 13,615,701   12,117,524        
Allowance     (54,619)        
Previously Reported | Commercial              
Assets              
Loans 4,307,505   2,890,296        
Allowance     (22,585)        
Previously Reported | Commercial real estate              
Assets              
Loans 5,403,316   5,166,792        
Allowance     (21,588)        
Previously Reported | Residential real estate              
Assets              
Loans 2,229,298   2,334,289        
Allowance     (2,299)        
Previously Reported | Consumer              
Assets              
Loans 1,675,582   1,726,147        
Allowance     (8,147)        
Segment Portfolio Reclassifications | Commercial              
Assets              
Loans (193,861)   (75,142)        
Allowance     1,226        
Segment Portfolio Reclassifications | Commercial real estate              
Assets              
Loans (166,369)   (277,539)        
Allowance     1,053        
Segment Portfolio Reclassifications | BBCC              
Assets              
Loans 360,230   352,681        
Allowance     (2,279)        
Segment Portfolio Reclassifications | Residential real estate              
Assets              
Loans 0   0        
Allowance     0        
Segment Portfolio Reclassifications | Consumer              
Assets              
Loans (1,675,582)   (1,726,147)        
Allowance     8,147        
Segment Portfolio Reclassifications | Indirect              
Assets              
Loans 933,723   935,584        
Allowance     (5,319)        
Segment Portfolio Reclassifications | Direct              
Assets              
Loans 194,573   228,524        
Allowance     (1,863)        
Segment Portfolio Reclassifications | Home equity              
Assets              
Loans $ 547,286   562,039        
Allowance     $ (965)        
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.