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Securities - Fair Values and Amortized Costs Securities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost $ 690,834    
Debt Securities, Available-for-Sale, Gross Unrealized Gains 1,960   $ 5,645 [1]
Debt Securities, Available-for-Sale, Gross Unrealized Losses (15,573)   (3,967) [1]
Debt Securities, Available-for-Sale, Fair Value 677,221   693,147
Equity Securities, Fair Value 5,314   5,144
Total Securities, Amortized Cost     695,284
Total Securities, Gross Unrealized Gains     6,975
Total Securities, Gross Unrealized Losses     (3,968)
Total Securities, Fair Value 682,535   698,291
U.S. Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 9,956   19,943
Debt Securities, Available-for-Sale, Gross Unrealized Gains 0   0
Debt Securities, Available-for-Sale, Gross Unrealized Losses (400)   (154)
Debt Securities, Available-for-Sale, Fair Value 9,556   19,789
Obligations of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 139,272   162,045
Debt Securities, Available-for-Sale, Gross Unrealized Gains 0   341
Debt Securities, Available-for-Sale, Gross Unrealized Losses (2,288)   (193)
Debt Securities, Available-for-Sale, Fair Value 136,984   162,193
Collateralized mortgage obligations of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 141,283   109,916
Debt Securities, Available-for-Sale, Gross Unrealized Gains 0   93
Debt Securities, Available-for-Sale, Gross Unrealized Losses (3,623)   (1,321)
Debt Securities, Available-for-Sale, Fair Value 137,660   108,688
Residential mortgage-backed securities of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 26,837   32,388
Debt Securities, Available-for-Sale, Gross Unrealized Gains 219   679
Debt Securities, Available-for-Sale, Gross Unrealized Losses (606)   (213)
Debt Securities, Available-for-Sale, Fair Value 26,450   32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 253,090   244,018 [2]
Debt Securities, Available-for-Sale, Gross Unrealized Gains 0   247 [2]
Debt Securities, Available-for-Sale, Gross Unrealized Losses (8,494)   (2,044) [2]
Debt Securities, Available-for-Sale, Fair Value 244,596   242,221 [2]
Securities purchased pending settlement     5,900
Obligations of states and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 120,396   123,159
Debt Securities, Available-for-Sale, Gross Unrealized Gains 1,741   4,285
Debt Securities, Available-for-Sale, Gross Unrealized Losses (162)   (42)
Debt Securities, Available-for-Sale, Fair Value 121,975   127,402
Total Debt Securities Available-for-Sale      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost 690,834   691,469
Debt Securities, Available-for-Sale, Gross Unrealized Gains 1,960   5,645
Debt Securities, Available-for-Sale, Gross Unrealized Losses (15,573)   (3,967)
Debt Securities, Available-for-Sale, Fair Value 677,221   693,147
Marketable equity securities      
Debt Securities, Available-for-sale [Line Items]      
Equity Securities, FV-NI, Cost [3] 0   3,815
Equity Securities, FV-NI, Unrealized Gain [3] 0 $ 1,330  
Equity Securities, FV-NI, Unrealized Loss [3] 0 $ (1)  
Equity Securities, Fair Value [3] $ 0   $ 5,144
[1] Gross unrealized gains and losses of $862 at December 31, 2017 have been restated to reflect the reclassifications from OCI to retained earnings due to the adoption of ASU No. 2016-01
[2] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.
[3] ASU No. 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.