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Securities, Amortized Cost and Fair Value Securities Available for Sale Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Maturing within one year $ 22,748  
Maturing after one year but within five years 99,528  
Maturing after five years but within ten years 83,969  
Maturing after ten years 348,963  
Amortized cost 555,208  
U.S. agency residential mortgage-backed 399,290  
U.S. agency commercial mortgage-backed 11,516  
Private label mortgage-backed 41,624  
Other asset backed 226,812  
Amortized cost 1,234,450 $ 1,052,132
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Maturing within one year 22,888  
Maturing after one year but within five years 102,202  
Maturing after five years but within ten years 85,830  
Maturing after ten years 352,889  
Total available-for-sale securities fair value 563,809  
U.S. agency residential mortgage-backed 400,420  
U.S. agency commercial mortgage-backed 11,704  
Private label mortgage-backed 42,817  
Other asset backed 228,530  
Total $ 1,247,280 $ 1,072,159