Securities - Exposure to Bond Issuers that Exceeded 10% of Stockholders' Equity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Concentration Risk [Line Items]
Amortized Cost	$ 451,217	$ 364,156
Stockholders' Equity, Total
Concentration Risk [Line Items]
Amortized Cost	368,616
Fair Value	298,990
Stockholders' Equity, Total | U.S. Government Treasuries (U.S.)
Concentration Risk [Line Items]
Amortized Cost	100,956
Fair Value	98,228
Stockholders' Equity, Total | Federal Home Loan Bank (FHLB)
Concentration Risk [Line Items]
Amortized Cost	32,068
Fair Value	25,169
Stockholders' Equity, Total | Federal Home Loan Mortgage Corporation (Freddie Mac-FHLMC)
Concentration Risk [Line Items]
Amortized Cost	97,444
Fair Value	68,312
Stockholders' Equity, Total | Federal Farm Credit Bank (FFCB)
Concentration Risk [Line Items]
Amortized Cost	138,148
Fair Value	$ 107,281