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Securities, Amortized Cost and Fair Value Securities Available for Sale Contractual Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Maturing within one year $ 15,770  
Maturing after one year but within five years 112,878  
Maturing after five years but within ten years 165,791  
Maturing after ten years 373,843  
Amortized cost 668,282  
U.S. agency residential mortgage-backed 364,072  
U.S. agency commercial mortgage-backed 18,829  
Private label mortgage-backed 67,976  
Other asset backed 193,509  
Amortized cost 1,312,668 $ 1,052,132
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Maturing within one year 16,080  
Maturing after one year but within five years 116,373  
Maturing after five years but within ten years 171,342  
Maturing after ten years 377,998  
Total available-for-sale securities fair value 681,793  
U.S. agency residential mortgage-backed 365,367  
U.S. agency commercial mortgage-backed 19,010  
Private label mortgage-backed 69,264  
Other asset backed 195,226  
Total $ 1,330,660 $ 1,072,159