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Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Available for sale:    
Total $ 1,226,954 $ 1,111,168
Unrealized Gain 34,005 6,263
Unrealized Loss (2,580) (14,209)
Estimated Fair Value 1,258,379 1,103,222
Held to maturity:    
Amortized Cost 42,997 45,210
Unrealized Gain 790 148
Unrealized Loss (128) (686)
Estimated Fair Value 43,659 44,672
Total investment securities    
Amortized Cost 1,269,951 1,156,378
Unrealized Gain 34,795 6,411
Unrealized Loss (2,708) (14,895)
Estimated Fair Value 1,302,038 1,147,894
U.S. Treasury    
Available for sale:    
Total 59,745 59,688
Unrealized Gain 3,807 1,224
Unrealized Loss 0 0
Estimated Fair Value 63,552 60,912
Agency    
Available for sale:    
Total 189,832 128,958
Unrealized Gain 9,706 1,631
Unrealized Loss (305) (519)
Estimated Fair Value 199,233 130,070
Corporate    
Available for sale:    
Total 122,755 104,158
Unrealized Gain 1,447 291
Unrealized Loss (83) (906)
Estimated Fair Value 124,119 103,543
Municipal bonds    
Available for sale:    
Total 278,962 238,914
Unrealized Gain 9,573 1,941
Unrealized Loss (129) (2,225)
Estimated Fair Value 288,406 238,630
Collateralized mortgage obligation: residential    
Available for sale:    
Total 19,197 24,699
Unrealized Gain 93 64
Unrealized Loss (54) (425)
Estimated Fair Value 19,236 24,338
Mortgage-backed securities: residential    
Available for sale:    
Total 556,463 554,751
Unrealized Gain 9,379 1,112
Unrealized Loss (2,009) (10,134)
Estimated Fair Value 563,833 545,729
Held to maturity:    
Amortized Cost 41,225 43,381
Unrealized Gain 790 148
Unrealized Loss (128) (686)
Estimated Fair Value 41,887 42,843
Other    
Held to maturity:    
Amortized Cost 1,772 1,829
Unrealized Gain 0 0
Unrealized Loss 0 0
Estimated Fair Value $ 1,772 $ 1,829