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Investment Securities - By Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost    
Due in One Year or Less $ 498  
Due after One Year through Five Years 68,974  
Due after Five Years through Ten Years 534,853  
Due after Ten Years 609,878  
Total 1,214,203 $ 1,111,168
Fair Value    
Due in One Year or Less 499  
Due after One Year through Five Years 71,517  
Due after Five Years through Ten Years 551,887  
Due after Ten Years 632,752  
Total 1,256,655 1,103,222
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 913  
Due after Five Years through Ten Years 0  
Due after Ten Years 39,520  
Amortized Cost 40,433 45,210
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 953  
Due after Five Years through Ten Years 0  
Due after Ten Years 40,349  
Total 41,302 44,672
Amortized Cost    
Due in One Year or Less 498  
Due after One Year through Five Years 69,887  
Due after Five Years through Ten Years 534,853  
Due after Ten Years 649,398  
Total 1,254,636  
Fair Value    
Due in One Year or Less 499  
Due after One Year through Five Years 72,470  
Due after Five Years through Ten Years 551,887  
Due after Ten Years 673,101  
Total 1,297,957  
U.S. Treasury    
Amortized Cost    
Due in One Year or Less 498  
Due after One Year through Five Years 20,171  
Due after Five Years through Ten Years 39,788  
Due after Ten Years 0  
Total 60,457 59,688
Fair Value    
Due in One Year or Less 499  
Due after One Year through Five Years 20,702  
Due after Five Years through Ten Years 42,989  
Due after Ten Years 0  
Total 64,190 60,912
Agency    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 42,658  
Due after Five Years through Ten Years 165,240  
Due after Ten Years 43,431  
Total 251,329 128,958
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 44,453  
Due after Five Years through Ten Years 171,635  
Due after Ten Years 45,470  
Total 261,558 130,070
Corporate    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 125,564  
Due after Ten Years 0  
Total 125,564 104,158
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 127,802  
Due after Ten Years 0  
Total 127,802 103,543
Municipal bonds    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 3,569  
Due after Five Years through Ten Years 34,911  
Due after Ten Years 241,113  
Total 279,593 238,914
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 3,710  
Due after Five Years through Ten Years 36,057  
Due after Ten Years 254,332  
Total 294,099 238,630
Collateralized mortgage obligation: residential    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 657  
Due after Ten Years 9,857  
Total 10,514 24,699
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 652  
Due after Ten Years 9,990  
Total 10,642 24,338
Mortgage-backed securities: residential    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 2,576  
Due after Five Years through Ten Years 168,693  
Due after Ten Years 315,477  
Total 486,746 554,751
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 2,652  
Due after Five Years through Ten Years 172,752  
Due after Ten Years 322,960  
Total 498,364 545,729
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 913  
Due after Five Years through Ten Years 0  
Due after Ten Years 37,773  
Amortized Cost 38,686 43,381
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 953  
Due after Five Years through Ten Years 0  
Due after Ten Years 38,602  
Total 39,555 $ 42,843
Other    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 1,747  
Amortized Cost 1,747  
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 1,747  
Total $ 1,747