Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available for Sale, Fair Value
Debt Securities, Available-for-sale, Amortized Cost	$ 1,646,938	$ 1,583,736
Debt Securities, Available-for-sale	1,552,731	1,571,148
Held to Maturity, Fair Value
Debt Securities, Held-to-maturity	1,282,441	1,066,818
Held to Maturity, Fair Value, Total	1,210,938	1,064,133
Available for Sale Securities and Held to Maturity Securities Amortized Cost	2,929,379
Debt Securities, Available-for-sale and Held-to-maturity	2,763,669
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	19,824
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	19,844
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	906,381
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	861,443
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	988,746
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	917,549
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	1,014,428
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Fair Value	964,833
U.S. government agency securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	68,071
Available for Sale, Amortized Cost, Due after five to ten years	163,414
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	64,776
Available for Sale, Fair Value, Due after five to ten years	151,159
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	231,485	217,393
Debt Securities, Available-for-sale	215,935	215,482
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	32,555
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	30,981
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	32,555	32,987
Held to Maturity, Fair Value, Total	30,981	32,546
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	68,455
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	65,788
Debt Securities, Available-for-sale, Amortized Cost	68,455	47,075
Debt Securities, Available-for-sale	65,788	48,914
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	20,513
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	20,104
Debt Securities, Held-to-maturity	20,513	21,023
Held to Maturity, Fair Value, Total	20,104	21,756
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	19,824
Available for Sale, Amortized Cost, Due after one year to five years	791,730
Available for Sale, Amortized Cost, Due after five to ten years	552,353
Available for Sale, Amortized Cost, Due after ten years	283,031
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	19,844
Available for Sale, Fair Value, Due after one year to five years	751,212
Available for Sale, Fair Value, Due after five to ten years	510,804
Available for Sale, Fair Value, Due after ten years	270,871
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	114,651
Held to Maturity, Amortized Cost, Due after five to ten years	436,393
Held to Maturity, Amortized Cost, Due after ten years	731,397
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	110,231
Held to Maturity, Fair Value, Due after five to ten years	406,745
Held to Maturity, Fair Value, Due after ten years	693,962
Held to Maturity, Fair Value, Total	1,210,938
Pooled trust preferred securities issued by banks and insurers
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	1,199
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	999
Debt Securities, Available-for-sale, Amortized Cost	1,199	1,199
Debt Securities, Available-for-sale	999	1,000
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	489
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	489
Debt Securities, Available-for-sale, Amortized Cost	489	489
Debt Securities, Available-for-sale	489	491
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	1,500
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	1,508
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	1,500	1,500
Held to Maturity, Fair Value, Total	1,508	1,508
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	192
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	200
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	192	192
Debt Securities, Available-for-sale	200	203
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	49,759
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	49,002
Debt Securities, Available-for-sale, Amortized Cost	49,759	78,966
Debt Securities, Available-for-sale	49,002	79,677
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	34,215
Held to Maturity, Amortized Cost, Due after ten years	542,749
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	32,252
Held to Maturity, Fair Value, Due after ten years	510,314
Debt Securities, Held-to-maturity	576,964	415,736
Held to Maturity, Fair Value, Total	542,566	408,845
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	19,824
Available for Sale, Amortized Cost, Due after one year to five years	80,449
Available for Sale, Amortized Cost, Due after five to ten years	158,349
Available for Sale, Amortized Cost, Due after ten years	163,129
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	19,844
Available for Sale, Fair Value, Due after one year to five years	78,736
Available for Sale, Fair Value, Due after five to ten years	144,812
Available for Sale, Fair Value, Due after ten years	154,593
Debt Securities, Available-for-sale, Amortized Cost	421,751	364,955
Debt Securities, Available-for-sale	397,985	363,933
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	32,356
Held to Maturity, Amortized Cost, Due after five to ten years	349,842
Held to Maturity, Amortized Cost, Due after ten years	168,135
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	32,265
Held to Maturity, Fair Value, Due after five to ten years	325,374
Held to Maturity, Fair Value, Due after ten years	163,544
Debt Securities, Held-to-maturity	550,333	493,012
Held to Maturity, Fair Value, Total	521,183	497,236
US Treasury Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	643,018
Available for Sale, Amortized Cost, Due after five to ten years	230,590
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	607,500
Available for Sale, Fair Value, Due after five to ten years	214,833
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	873,608	873,467
Debt Securities, Available-for-sale	822,333	861,448
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	49,740
Held to Maturity, Amortized Cost, Due after five to ten years	50,836
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	46,985
Held to Maturity, Fair Value, Due after five to ten years	47,611
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	100,576	102,560
Held to Maturity, Fair Value, Total	$ 94,596	$ 102,242