Investment Securities (Held-to-maturity Securities with Unrealized Loss) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) securities	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) securities	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 172,186,000		$ 172,186,000		$ 18,662,000
Less than 12 months, unrealized loss	$ 4,757,000		$ 4,757,000		$ 165,000
Less than 12 months, no. of securities | securities	55		55		5
12 months or more, fair value	$ 0		$ 0		$ 0
12 months or more, unrealized loss	$ 0		$ 0		$ 0
12 months or more, no. of securities | securities	0		0		0
Total fair value	$ 172,186,000		$ 172,186,000		$ 18,662,000
Total unrealized loss	4,757,000		4,757,000		165,000
Gross losses realized	316,000	$ 0	1,490,000	$ 3,000
Realized Gain (Loss) on Held-to-Maturity Securities			0	$ 0
Securities Investment [Member]
Schedule of Held-to-maturity Securities [Line Items]
Interest Receivable	5,700,000		5,700,000		2,700,000
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	17,426,000		17,426,000
Less than 12 months, unrealized loss	$ 195,000		$ 195,000
Less than 12 months, no. of securities | securities	2		2
12 months or more, fair value	$ 0		$ 0
12 months or more, unrealized loss	$ 0		$ 0
12 months or more, no. of securities | securities	0		0
Total fair value	$ 17,426,000		$ 17,426,000
Total unrealized loss	195,000		195,000		0
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	39,641,000		39,641,000
Less than 12 months, unrealized loss	$ 1,208,000		$ 1,208,000
Less than 12 months, no. of securities | securities	11		11
12 months or more, fair value	$ 0		$ 0
12 months or more, unrealized loss	$ 0		$ 0
12 months or more, no. of securities | securities	0		0
Total fair value	$ 39,641,000		$ 39,641,000
Total unrealized loss	1,208,000		1,208,000		0
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	89,532,000		89,532,000		18,662,000
Less than 12 months, unrealized loss	$ 2,421,000		$ 2,421,000		$ 165,000
Less than 12 months, no. of securities | securities	37		37		5
12 months or more, fair value	$ 0		$ 0		$ 0
12 months or more, unrealized loss	$ 0		$ 0		$ 0
12 months or more, no. of securities | securities	0		0		0
Total fair value	$ 89,532,000		$ 89,532,000		$ 18,662,000
Total unrealized loss	2,421,000		2,421,000		$ 165,000
Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	25,587,000		25,587,000
Less than 12 months, unrealized loss	$ 933,000		$ 933,000
Less than 12 months, no. of securities | securities	5		5
12 months or more, fair value	$ 0		$ 0
12 months or more, unrealized loss	$ 0		$ 0
12 months or more, no. of securities | securities	0		0
Total fair value	$ 25,587,000		$ 25,587,000
Total unrealized loss	$ 933,000		$ 933,000