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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized cost $ 839,192 $ 793,634
Estimated Fair Value 843,363 784,139
U. S. agency securities    
One year or less, amortized cost 96,332 128,148
After one year through five years, amortized cost 76,121 119,856
Five years through ten years, amortized cost 7,775 12,146
Amortized cost 180,228 260,150
One year or less, estimated fair value 96,226 125,545
After one year through five years, estimated fair value 75,821 118,883
Five years through ten years, estimated fair value 7,747 11,917
Estimated Fair Value 179,794 256,345
Residential mortgage backed securities    
Amortized cost, without maturity date 541,490 477,949
Amortized cost 541,490 477,949
Estimated fair value, without maturity date 543,852 472,231
Estimated Fair Value 543,852 472,231
Municipal bonds    
One year or less, amortized cost 5,897 8,097
After one year through five years, amortized cost 21,416 15,025
Five years through ten years, amortized cost 42,589 21,626
After ten years, amortized cost 2,000 1,066
Amortized cost 71,902 45,814
One year or less, estimated fair value 5,969 8,167
After one year through five years, estimated fair value 21,953 15,081
Five years through ten years, estimated fair value 44,015 21,385
After ten years, estimated fair value 1,994 1,136
Estimated Fair Value 73,931 45,769
Corporate bonds    
One year or less, amortized cost 502  
After one year through five years, amortized cost 8,528 8,003
After ten years, amortized cost 1,500 1,500
Amortized cost 10,530 9,503
One year or less, estimated fair value 508  
After one year through five years, estimated fair value 8,725 8,076
After ten years, estimated fair value 1,500 1,500
Estimated Fair Value 10,733 9,576
U.S. Treasury    
Amortized cost, without maturity date 34,844  
Amortized cost 34,844  
Estimated fair value, without maturity date 34,855  
Estimated Fair Value 34,855  
Other equity investments    
Amortized cost, without maturity date 198 218
Amortized cost 198 218
Estimated fair value, without maturity date 198 218
Estimated Fair Value $ 198 $ 218