Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 1,156,119	$ 1,028,550
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	33,052	38,272
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	1,122	291
Fair Value	1,188,049	1,066,531
Allowance for credit losses - securities held-to-maturity	(161)	(191)
Securities held-to-maturity, net of allowance for credit losses	1,155,958	1,028,359
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in one year or less	0
Due in one year to five years	13,330
Due in five to ten years	5,648
Due after ten years	1,030,586
Mortgage-backed securities	106,555
Asset-backed securities	0
Amortized cost	1,156,119	1,028,550
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in one year or less	0
Due in one year to five years	13,342
Due in five to ten years	5,728
Due after ten years	1,062,534
Mortgage-backed securities	106,445
Asset-backed securities	0
Fair Value	1,188,049	1,066,531
U.S. Government Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	11,920
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	37
Fair Value	11,883
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized cost	11,920
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	11,883
Mortgage-backed Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	106,555
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	86
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	196
Fair Value	106,445
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized cost	106,555
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	106,445
State and Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,037,644	1,028,550
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	32,966	38,272
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	889	291
Fair Value	1,069,721	1,066,531
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized cost	1,037,644	1,028,550
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	$ 1,069,721	$ 1,066,531

Debt Securities Held to Maturity Net of Allowance for Credit Losses

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