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Investments Schedule of Available-for-sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 1,109,785 $ 1,182,427
Available-for-sale Securities, Gross Unrealized Gains 1,982 5,072
Available-for-sale Securities, Gross Unrealized Losses (34,800) (17,171)
Available-for-sale securities at fair value 1,076,967 1,170,328
Debt Securities, Held-to-maturity 78,955 74,576
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,210) (795)
Debt Securities, Held-to-maturity, Fair Value 76,747 73,781
US Government and Government Agencies and Authorities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 35,061 35,132
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses (1,361) (833)
Available-for-sale securities at fair value 33,700 34,299
Debt Securities, Held-to-maturity 11,902  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0  
Debt Securities, Held-to-maturity, Fair Value 11,904  
US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 275,881 305,101
Available-for-sale Securities, Gross Unrealized Gains 0 22
Available-for-sale Securities, Gross Unrealized Losses (6,277) (2,622)
Available-for-sale securities at fair value 269,604 302,501
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 297,257 299,647
Available-for-sale Securities, Gross Unrealized Gains 1,722 4,559
Available-for-sale Securities, Gross Unrealized Losses (3,790) (1,148)
Available-for-sale securities at fair value 295,189 303,058
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis [1] 493,644 521,753
Available-for-sale Securities, Gross Unrealized Gains [1] 260 491
Available-for-sale Securities, Gross Unrealized Losses [1] (23,372) (12,568)
Available-for-sale securities at fair value [1] 470,532 509,676
Debt Securities, Held-to-maturity [1] 67,053 74,576
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain [1] 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss [1] (2,210) (795)
Debt Securities, Held-to-maturity, Fair Value [1] 64,843 73,781
Other Aggregated Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 7,942 20,794
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale securities at fair value $ 7,942 $ 20,794
[1] All mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.