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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Participation interest in loans originated	$ 242,600,000	$ 274,900,000
Non-accrual loans, interest income lost	1,500,000	967,000
Loans returned to accrual, interest income	710,000	1,100,000
Loans Receivable >90 Days and Accruing	333,000	795,000
Loans acquired with deteriorated credit quality, fair value	1,100,000	3,500,000
Troubled debt restructurings, subsequent default, amount	$ 216,000	$ 105,000
Troubled debt restructuring, subsequent default, number | loan	1	1
Financing receivables	$ 2,330,018,000	$ 2,203,315,000
Transfers from non-accretable differences	0	0
IA Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loans acquired	1,400,000	3,800,000
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	68,600,000	13,500,000
Substandard [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	$ 68,600,000	$ 13,500,000

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Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of financing receivable 90 days or more past due and still accruing.

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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