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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost $ 783,599 $ 484,073  
Unrealized gains 3,362 1,805  
Unrealized losses 8,286 4,007  
Estimated fair value 778,675 481,871  
Held-to-maturity securities sold, amortized cost 0 800 $ 0
Held-to-maturity securities sold, unrealized loss   (2)  
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits 1,500,000 1,500,000  
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 215,300 231,300  
Federal Agency [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 19,995    
Unrealized gains 52    
Unrealized losses 0    
Estimated fair value 20,047    
Mortgage-backed Securities, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 164,618 96,357  
Unrealized gains 712 85  
Unrealized losses 2,773 810  
Estimated fair value 162,557 95,632  
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 15,230 418  
Unrealized gains 403 57  
Unrealized losses 0 0  
Estimated fair value 15,633 475  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 257,475 186,327  
Unrealized gains 1,097 224  
Unrealized losses 3,897 2,577  
Estimated fair value 254,675 183,974  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 83,148    
Unrealized gains 767    
Unrealized losses 0    
Estimated fair value 83,915    
State & Municipal [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 243,133 200,971  
Unrealized gains 331 1,439  
Unrealized losses 1,616 620  
Estimated fair value $ 241,848 $ 201,790