XML 73 R58.htm IDEA: XBRL DOCUMENT v3.10.0.1
Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost - Due within one year $ 751  
Amortized Cost - Due after one year through five years 17,565  
Amortized Cost - Due after five years through ten years 27,873  
Amortized Cost - Due after ten years 35,979  
Amortized Cost 1,893,618 $ 1,751,879
Estimated Fair Value - Due within one year 761  
Estimated Fair Value - Due after one year through five years 17,669  
Estimated Fair Value - Due after five years through ten years 27,901  
Estimated Fair Value - Due after ten years 33,081  
Estimated Fair Value 1,846,265 1,720,257
Carrying values of securities pledged as collateral 354,600 359,200
Collateralized Mortgage Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 914,710  
Amortized Cost 914,710 856,193
Estimated Fair Value 895,122  
Estimated Fair Value 895,122 838,709
Mortgage-backed Securities, Residential    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 415,659  
Amortized Cost 415,659 477,676
Estimated Fair Value 402,605  
Estimated Fair Value 402,605 471,214
Mortgage-backed Securities, Commercial    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 481,081  
Amortized Cost 481,081 308,046
Estimated Fair Value 469,126  
Estimated Fair Value 469,126 301,365
Mutual funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   22,425
Estimated Fair Value   21,957
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,000 4,997
Estimated Fair Value $ 3,826 $ 4,475