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Securities - Credit Quality Indicator (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 877,613
Mortgage Backed Securities With Credit Quality Indicators
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	49,745
Mortgage Backed Securities With Credit Quality Indicators | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	16,909
Mortgage Backed Securities With Credit Quality Indicators | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	32,836
Mortgage Backed Securities With Credit Quality Indicators | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Mortgage Backed Securities With Credit Quality Indicators | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Mortgage Backed Securities With Credit Quality Indicators | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment And Mortgage-Backed Securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	341,896
Investment And Mortgage-Backed Securities | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	52,189
Investment And Mortgage-Backed Securities | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	167,456
Investment And Mortgage-Backed Securities | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	58,350
Investment And Mortgage-Backed Securities | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	52,569
Investment And Mortgage-Backed Securities | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	11,332
Investment securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	292,151
Investment securities | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	35,280
Investment securities | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	134,620
Investment securities | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	58,350
Investment securities | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	52,569
Investment securities | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	11,332
Investment securities | U.S. government and agency obligations
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	4,997
Investment securities | U.S. government and agency obligations | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | U.S. government and agency obligations | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	4,997
Investment securities | U.S. government and agency obligations | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | U.S. government and agency obligations | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | U.S. government and agency obligations | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | State and municipal obligations
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	214,865
Investment securities | State and municipal obligations | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	35,280
Investment securities | State and municipal obligations | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	128,128
Investment securities | State and municipal obligations | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	46,390
Investment securities | State and municipal obligations | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	5,067
Investment securities | State and municipal obligations | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | Corporate debt securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	72,289
Investment securities | Corporate debt securities | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
Investment securities | Corporate debt securities | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	1,495
Investment securities | Corporate debt securities | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	11,960
Investment securities | Corporate debt securities | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	47,502
Investment securities | Corporate debt securities | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	11,332
CMO | Mortgage Backed Securities With Credit Quality Indicators
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	49,745
CMO | Mortgage Backed Securities With Credit Quality Indicators | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	16,909
CMO | Mortgage Backed Securities With Credit Quality Indicators | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	32,836
CMO | Mortgage Backed Securities With Credit Quality Indicators | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
CMO | Mortgage Backed Securities With Credit Quality Indicators | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0
CMO | Mortgage Backed Securities With Credit Quality Indicators | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 0

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