XML 69 R54.htm IDEA: XBRL DOCUMENT v3.10.0.1
Summary of Significant Accounting Policies - Additional information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
lease
Jan. 01, 2018
USD ($)
Schedule of Significant Accounting Policies [Line Items]          
Reserve and clearing requirement balance $ 0 $ 0      
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01         $ (188)
Aggregate carrying value of properties foreclosed on 3,300        
Net valuation adjustments subsequent to foreclosures 115        
Proceeds from sales of OREO 6,667 14,802 $ 17,390    
Impairment of investments in affordable housing partnership 0 4,846 $ 0    
Impairment of investments in affordable housing partnership, noninterest expense   3,300      
Impairment of investments in affordable housing partnership, Tax Act result   1,600      
Payments of cash dividends on Common Stock 71,600 67,700      
Loss Contingency Accrual 755 414      
Reclassification of stranded tax effects to retained earnings - ASU 2018-02   0      
Accounting Standards Update 2016-02 | Subsequent Event          
Schedule of Significant Accounting Policies [Line Items]          
Number of operating leases | lease       96  
Right-of-use asset       $ 64,300  
Right-of-use liability       $ 64,300  
Retained Earnings          
Schedule of Significant Accounting Policies [Line Items]          
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 $ (469)       $ (469)
Reclassification of stranded tax effects to retained earnings - ASU 2018-02   $ 3,597      
Minimum | Buildings          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 15 years        
Minimum | Furniture , fixture and equipment          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 3 years        
Minimum | Computer equipment          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 1 year        
Minimum | Computer Software          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 1 year        
Maximum | Buildings          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 39 years        
Maximum | Furniture , fixture and equipment          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 10 years        
Maximum | Computer equipment          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 5 years        
Maximum | Computer Software          
Schedule of Significant Accounting Policies [Line Items]          
Estimated useful lives 5 years        
Core deposits | Minimum          
Schedule of Significant Accounting Policies [Line Items]          
Amortization period 7 years        
Core deposits | Maximum          
Schedule of Significant Accounting Policies [Line Items]          
Amortization period 10 years