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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Interest income, including loan fees $ 64,500 $ 64,180  
Credit for funds provided 0 0  
Total interest income 64,500 64,180  
Interest expense 1,984 3,171  
Charge for funds used 0 0  
Total interest expense 1,984 3,171  
Net interest income 62,516 61,009  
Provision for loan losses 0 0  
Net interest income after provision for loan losses 62,516 61,009  
Noninterest income 8,683 8,011  
Noninterest expense 34,364 30,602  
Debt termination expense 0 13,870  
Earnings before income taxes 36,835 24,548  
Segment assets 7,920,836 7,442,951 $ 7,671,200
Operating Segments [Member] | Centers [Member]      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 36,504 35,368  
Credit for funds provided 8,697 8,211  
Total interest income 45,201 43,579  
Interest expense 1,680 1,663  
Charge for funds used 1,287 1,067  
Total interest expense 2,967 2,730  
Net interest income 42,234 40,849  
Provision for loan losses 0 0  
Net interest income after provision for loan losses 42,234 40,849  
Noninterest income 4,827 5,067  
Noninterest expense 12,610 11,849  
Debt termination expense 0 0  
Earnings before income taxes 34,451 34,067  
Segment assets 6,602,994 6,216,028  
Operating Segments [Member] | Treasury [Member]      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 18,757 18,655  
Credit for funds provided 0    
Total interest income 18,757 18,655  
Interest expense 184 1,431  
Charge for funds used 15,349 14,806  
Total interest expense 15,533 16,237  
Net interest income 3,224 2,418  
Provision for loan losses 0 0  
Net interest income after provision for loan losses 3,224 2,418  
Noninterest income 0    
Noninterest expense 216 213  
Debt termination expense 0 13,870  
Earnings before income taxes 3,008 (11,665)  
Segment assets 3,417,737 3,450,529  
Operating Segments [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 9,239 10,157  
Credit for funds provided 13,681 12,641  
Total interest income 22,920 22,798  
Interest expense 120 77  
Charge for funds used 5,742 4,979  
Total interest expense 5,862 5,056  
Net interest income 17,058 17,742  
Provision for loan losses 0 0  
Net interest income after provision for loan losses 17,058 17,742  
Noninterest income 3,856 2,944  
Noninterest expense 21,538 18,540  
Debt termination expense 0 0  
Earnings before income taxes (624) 2,146  
Segment assets 976,032 898,554  
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 0 0  
Credit for funds provided (22,378) (20,852)  
Total interest income (22,378) (20,852)  
Interest expense 0 0  
Charge for funds used (22,378) (20,852)  
Total interest expense (22,378) (20,852)  
Net interest income 0 0  
Provision for loan losses 0 0  
Net interest income after provision for loan losses 0 0  
Noninterest income 0 0  
Noninterest expense 0 0  
Debt termination expense 0 0  
Earnings before income taxes 0 0  
Segment assets $ (3,075,927) $ (3,122,160)