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Securities - Debt Securities, Held-to-maturity, Credit Quality Indicator (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	$ 310,710
AAA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	34,091
AA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	130,714
A | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	71,250
BBB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	63,322
BB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,333
State and municipal obligations | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	238,405
State and municipal obligations | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	343,031
State and municipal obligations | AAA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	34,091
State and municipal obligations | AAA | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	45,209
State and municipal obligations | AA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	130,218
State and municipal obligations | AA | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	151,917
State and municipal obligations | A | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	59,272
State and municipal obligations | A | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	71,250
State and municipal obligations | BBB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	14,824
State and municipal obligations | BBB | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	63,322
State and municipal obligations | BB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
State and municipal obligations | BB | Investment And C M O Mortgage Backed Securities
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,333
Corporate debt securities | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	72,305
Corporate debt securities | AAA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Corporate debt securities | AA | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	496
Corporate debt securities | A | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,978
Corporate debt securities | BBB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	48,498
Corporate debt securities | BB | Investment securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,333
Mortgage-backed securities:
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	32,321
Mortgage-backed securities: | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	32,321
Mortgage-backed securities: | AAA
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,118
Mortgage-backed securities: | AAA | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	11,118
Mortgage-backed securities: | AA
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	21,203
Mortgage-backed securities: | AA | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	21,203
Mortgage-backed securities: | A
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Mortgage-backed securities: | A | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Mortgage-backed securities: | BBB
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Mortgage-backed securities: | BBB | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Mortgage-backed securities: | BB
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	0
Mortgage-backed securities: | BB | CMO
Securities Financing Transaction [Line Items]
Debt securities held to maturity net of allowance for credit losses	$ 0

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