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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Amortized Cost    
Due within one year $ 750  
Due after one year through five years 3,560  
Due after five years through ten years 2,648  
Due after ten years 68,049  
Amortized Cost 1,817,265 $ 1,893,618
Estimated Fair Value    
Due within one year 752  
Due after one year through five years 3,569  
Due after five years through ten years 2,720  
Due after ten years 66,856  
Estimated Fair Value 1,826,903 1,846,265
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law 350,400 354,600
Collateralized mortgage obligations    
Amortized Cost    
Amortized Cost 842,576 914,710
Estimated Fair Value    
No single maturity date 844,899  
Estimated Fair Value 844,899 895,122
Residential    
Amortized Cost    
Amortized Cost 369,476 415,659
Estimated Fair Value    
No single maturity date 367,176  
Estimated Fair Value 367,176 402,605
Commercial    
Amortized Cost    
Amortized Cost 530,206 481,081
Estimated Fair Value    
No single maturity date 540,931  
Estimated Fair Value 540,931 469,126
Corporate securities    
Amortized Cost    
Amortized Cost 5,000 5,000
Estimated Fair Value    
Estimated Fair Value 3,880 3,826
Municipal securities    
Amortized Cost    
Amortized Cost 70,007 77,168
Estimated Fair Value    
Estimated Fair Value $ 70,017 $ 75,586