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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Sep. 30, 2019 USD ($)
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Held-to-Maturity |
Held-to-maturity, less than 12 months, estimated fair value | $ 4,043
Held-to-maturity, less than 12 months, gross unrealized losses | (15)
Held-to-maturity, 12 months or more, estimated fair value | 2,590
Held-to-maturity, 12 months or more, gross unrealized losses | (27)
Held-to-maturity, total, estimated fair value | 6,633
Held-to-maturity, total, gross unrealized losses | (42)
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 174,478
Available-for-sale, less than 12 months, gross unrealized losses | (605)
Available-for-sale, 12 months or more, estimated fair value | 529,478
Available-for-sale, 12 months or more, gross unrealized losses | (4,410)
Available-for-sale, total, estimated fair value | 703,956
Available-for-sale, total, gross unrealized losses | (5,015)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 16,662
Available-for-sale, less than 12 months, gross unrealized losses | (36)
Available-for-sale, 12 months or more, estimated fair value | 90,974
Available-for-sale, 12 months or more, gross unrealized losses | (1,166)
Available-for-sale, total, estimated fair value | 107,636
Available-for-sale, total, gross unrealized losses | (1,202)
Mortgage-backed securities |
Held-to-Maturity |
Held-to-maturity, less than 12 months, estimated fair value | 3,408
Held-to-maturity, less than 12 months, gross unrealized losses | (15)
Held-to-maturity, 12 months or more, estimated fair value | 2,575
Held-to-maturity, 12 months or more, gross unrealized losses | (27)
Held-to-maturity, total, estimated fair value | 5,983
Held-to-maturity, total, gross unrealized losses | (42)
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 133,538
Available-for-sale, less than 12 months, gross unrealized losses | (528)
Available-for-sale, 12 months or more, estimated fair value | 435,207
Available-for-sale, 12 months or more, gross unrealized losses | (3,213)
Available-for-sale, total, estimated fair value | 568,745
Available-for-sale, total, gross unrealized losses | (3,741)
State and political subdivisions |
Held-to-Maturity |
Held-to-maturity, less than 12 months, estimated fair value | 635
Held-to-maturity, less than 12 months, gross unrealized losses | 0
Held-to-maturity, 12 months or more, estimated fair value | 15
Held-to-maturity, 12 months or more, gross unrealized losses | 0
Held-to-maturity, total, estimated fair value | 650
Held-to-maturity, total, gross unrealized losses | 0
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 24,278
Available-for-sale, less than 12 months, gross unrealized losses | (41)
Available-for-sale, 12 months or more, estimated fair value | 3,297
Available-for-sale, 12 months or more, gross unrealized losses | (31)
Available-for-sale, total, estimated fair value | 27,575
Available-for-sale, total, gross unrealized losses | $ (72)

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