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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,028,550,000		$ 188,996,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	38,272,000		12,221,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	291,000		0
Fair Value	1,066,531,000		201,217,000
Allowance for credit losses - securities held-to-maturity	(191,000)	$ (10,000)
Securities held-to-maturity, net of allowance for credit losses	1,028,359,000		188,996,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in one year or less	0
Due in one year to five years	1,409,000
Due in five to ten years	7,180,000
Due after ten years	1,019,961,000
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	0
Held To Maturity Securities Debt Maturities Asset Backed Securities Amortized Cost	0
Amortized Cost	1,028,550,000		188,996,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in one year or less	0
Due in one year to five years	1,494,000
Due in five to ten years	7,300,000
Due after ten years	1,057,737,000
Mortgage-backed securities	0
Asset-backed securities	0
Fair Value	1,066,531,000		201,217,000
State And Municipal Securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,028,550,000		188,996,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	38,272,000		12,221,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	291,000		0
Fair Value	1,066,531,000		201,217,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized Cost	1,028,550,000		188,996,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	$ 1,066,531,000		$ 201,217,000

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