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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	$ 0	$ 0
Amortized Cost	1,029,001,000	770,195,000
Gross Unrealized Gains	24,824,000	32,521,000
Gross Unrealized Losses	(4,301,000)	(553,000)
Fair Value	1,049,524,000	802,163,000
U.S. government and agency securities
Investment Holdings [Line Items]
Amortized Cost	104,688,000	44,713,000
Gross Unrealized Gains	477,000	947,000
Gross Unrealized Losses	(1,518,000)	0
Fair Value	103,647,000	45,660,000
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	219,174,000	197,634,000
Gross Unrealized Gains	10,341,000	12,561,000
Gross Unrealized Losses	(588,000)	(227,000)
Fair Value	228,927,000	209,968,000
Residential CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	256,875,000	196,956,000
Gross Unrealized Gains	3,465,000	5,125,000
Gross Unrealized Losses	(846,000)	(209,000)
Fair Value		201,872,000
Commercial CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	413,304,000	290,638,000
Gross Unrealized Gains	9,973,000	13,198,000
Gross Unrealized Losses	(1,337,000)	(90,000)
Fair Value		303,746,000
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	7,004,000	10,971,000
Gross Unrealized Gains	17,000	125,000
Gross Unrealized Losses	(3,000)	0
Fair Value		11,096,000
Other asset-backed securities
Investment Holdings [Line Items]
Amortized Cost	27,956,000	29,283,000
Gross Unrealized Gains	551,000	565,000
Gross Unrealized Losses	$ (9,000)	(27,000)
Fair Value		$ 29,821,000

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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