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Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-Sale:    
Available-for-Sale, Amortized Cost $ 1,661,512 $ 1,624,976
Available-for-sale Securities, Gross Unrealized Gain1 8,728 6,782
Available-for-sale Securities, Gross Unrealized Loss1 (12,649) (20,060)
Available-for-Sale, Estimated Fair Value 1,657,591 1,611,698
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 490,968 512,770
Held-to-maturity Securities, Gross Unrealized Gain1 12,414 10,667
Held-to-maturity Securities, Gross Unrealized Loss1 (9,457) (10,164)
Held-to-Maturity, Estimated Fair Value 493,925 513,273
US Treasury Securities [Member]    
Available-for-Sale:    
Available-for-Sale, Amortized Cost 3,608 3,608
Available-for-sale Securities, Gross Unrealized Gain1 5 5
Available-for-sale Securities, Gross Unrealized Loss1 (1) (1)
Available-for-Sale, Estimated Fair Value 3,612 3,612
Obligations of U.S. government agencies    
Available-for-Sale:    
Available-for-Sale, Amortized Cost 411,096 397,411
Available-for-sale Securities, Gross Unrealized Gain1 449 343
Available-for-sale Securities, Gross Unrealized Loss1 (4,302) (6,457)
Available-for-Sale, Estimated Fair Value 407,243 391,297
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 19,737 19,737
Held-to-maturity Securities, Gross Unrealized Gain1 0 0
Held-to-maturity Securities, Gross Unrealized Loss1 (82) (162)
Held-to-Maturity, Estimated Fair Value 19,655 19,575
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations    
Available-for-Sale:    
Available-for-Sale, Amortized Cost 1,243,751 1,220,890
Available-for-sale Securities, Gross Unrealized Gain1 8,257 6,412
Available-for-sale Securities, Gross Unrealized Loss1 (8,345) (13,601)
Available-for-Sale, Estimated Fair Value 1,243,663 1,213,701
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 264,427 279,578
Held-to-maturity Securities, Gross Unrealized Gain1 9,044 7,804
Held-to-maturity Securities, Gross Unrealized Loss1 (9,086) (9,249)
Held-to-Maturity, Estimated Fair Value 264,385 278,133
Private mortgage-backed securities    
Available-for-Sale:    
Available-for-Sale, Amortized Cost 106 116
Available-for-sale Securities, Gross Unrealized Gain1 1 1
Available-for-sale Securities, Gross Unrealized Loss1 (1) (1)
Available-for-Sale, Estimated Fair Value 106 116
State, county and municipal securities    
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 153,679 160,192
Held-to-maturity Securities, Gross Unrealized Gain1 3,121 2,723
Held-to-maturity Securities, Gross Unrealized Loss1 (222) (542)
Held-to-Maturity, Estimated Fair Value 156,578 162,373
Corporate securities    
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 52,918 53,032
Held-to-maturity Securities, Gross Unrealized Gain1 248 139
Held-to-maturity Securities, Gross Unrealized Loss1 (67) (211)
Held-to-Maturity, Estimated Fair Value 53,099 52,960
Other Investments    
Held-to-Maturity:    
Held-to-Maturity, Amortized Cost 207 231
Held-to-maturity Securities, Gross Unrealized Gain1 1 1
Held-to-maturity Securities, Gross Unrealized Loss1 0 0
Held-to-Maturity, Estimated Fair Value 208 232
Other Investments    
Available-for-Sale:    
Available-for-Sale, Amortized Cost 2,951 2,951
Available-for-sale Securities, Gross Unrealized Gain1 16 21
Available-for-sale Securities, Gross Unrealized Loss1 0 0
Available-for-Sale, Estimated Fair Value $ 2,967 $ 2,972