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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance $ 936,227 $ 910,289 $ 920,964 $ 855,872 $ 855,872  
Ending balance 954,812 910,642 954,812 910,642 920,964  
Reclassification, available-for-sale debt securities, after tax 12,602 (5,440) (21,651) 4,063    
Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (35,711)   (249)      
Balance after reclassification adjustments on January 1, 2018         (1,458)  
Other comprehensive income (loss) before reclassifications (1,206)   (35,459)      
Amounts reclassified from accumulated other comprehensive income (loss) to net income 13,808   13,808      
Net current-period other comprehensive income (loss) 12,602   (21,651)      
Ending balance (23,109)   (23,109)   (249)  
Foreign Currency Items            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance 0   88      
Balance after reclassification adjustments on January 1, 2018         0  
Other comprehensive income (loss) before reclassifications 0   0      
Amounts reclassified from accumulated other comprehensive income (loss) to net income 0   0      
Net current-period other comprehensive income (loss) 0   0      
Ending balance 0   0   88  
Total Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (35,711) 6,822 (161) (2,681) (2,681)  
Balance after reclassification adjustments on January 1, 2018         (1,458)  
Other comprehensive income (loss) before reclassifications (1,206) (2,177) (35,459) 9,268    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 13,808 (3,263) 13,808 (5,205)    
Net current-period other comprehensive income (loss) 12,602 (5,440) (21,651) 4,063    
Ending balance (23,109) 1,382 (23,109) 1,382 (161)  
Unrealized Gains (Losses) on Cash Flow Hedges            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance 1,714 (1,458) (198) (2,211) (2,211)  
Balance after reclassification adjustments on January 1, 2018         (240)  
Other comprehensive income (loss) before reclassifications 3,006 104 5,055 (115)    
Amounts reclassified from accumulated other comprehensive income (loss) to net income (1,864) 349 (1,959) 1,321    
Net current-period other comprehensive income (loss) 1,142 453 3,096 1,206    
Ending balance 2,856 (1,005) 2,856 (1,005) (198)  
Accumulated Other Comprehensive (Loss) Income            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (33,997) 5,364 (359) (4,892) (4,892)  
Balance after reclassification adjustments on January 1, 2018         (1,698)  
Other comprehensive income (loss) before reclassifications 1,800 (2,073) (30,404) 9,153    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 11,944 (2,914) 11,849 (3,884)    
Net current-period other comprehensive income (loss) 13,744 (4,987) (18,555) 5,269    
Ending balance (20,253) 377 (20,253) 377 (359)  
Retained Earnings            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance 299,990 235,938 258,076 193,698 193,698  
Ending balance 302,404 240,076 302,404 240,076 $ 258,076  
ASU 2018-02 | Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           $ (256)
ASU 2018-02 | Foreign Currency Items            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           0
ASU 2018-02 | Total Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (256)
ASU 2018-02 | Unrealized Gains (Losses) on Cash Flow Hedges            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (42)
ASU 2018-02 | Accumulated Other Comprehensive (Loss) Income            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (298)
Accounting Standards Update 2016-01            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           0
Accounting Standards Update 2016-01 | Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (953)
Accounting Standards Update 2016-01 | Foreign Currency Items            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (88)
Accounting Standards Update 2016-01 | Total Unrealized Gains (Losses)            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (1,041)
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Cash Flow Hedges            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive (Loss) Income            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (1,041)
Accounting Standards Update 2016-01 | Retained Earnings            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           1,041
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated Other Comprehensive (Loss) Income            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           (1,300)
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Retained Earnings            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption           $ 1,300
Gain (Loss) on Sale of Investment Securities            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Reclassification, available-for-sale debt securities, before tax   5,300   8,500    
Reclassification, available-for-sale debt securities, after tax   3,300   5,200    
Interest Expense            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Reclassification, available-for-sale debt securities, before tax 18,700   13,800      
Reclassification, cash flow hedge, before tax 303 572 175 2,200    
Reclassification, cash flow hedge, after tax 224 $ 349 129 $ 1,300    
Non-interest income            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Reclassification, cash flow hedge, before tax $ 2,800          
Reclassification, cash flow hedge, after tax     $ 2,100