Investment Securities - Schedule of Gross Unrealized Losses and Fair Value by Length of Time that the Individual Available-For-Sale Securities Have Been in a Continuous Unrealized Loss (Details)
$ in Thousands |
Mar. 31, 2023
USD ($)
security
|
Dec. 31, 2022
USD ($)
security
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
254
|
260
|
| Less than 12 months, estimated fair value |
$ 499,312
|
$ 495,164
|
| Less than 12 months, unrealized losses |
(50,108)
|
(58,439)
|
| 12 months or greater, estimated fair value |
1,082,828
|
1,093,919
|
| 12 months or greater, unrealized losses |
(131,123)
|
(146,839)
|
| Estimated fair value |
1,582,140
|
1,589,083
|
| Unrealized losses |
$ (181,231)
|
$ (205,278)
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
234
|
232
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
$ 24,489
|
$ 23,881
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
(2,625)
|
(3,228)
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
941,297
|
932,753
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
(108,900)
|
(122,205)
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
965,786
|
956,634
|
| Gross unrealized losses |
$ (111,525)
|
$ (125,433)
|
| U.S. treasury bonds |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
2
|
2
|
| Less than 12 months, estimated fair value |
$ 0
|
$ 0
|
| Less than 12 months, unrealized losses |
0
|
0
|
| 12 months or greater, estimated fair value |
46,931
|
46,327
|
| 12 months or greater, unrealized losses |
(2,887)
|
(3,466)
|
| Estimated fair value |
46,931
|
46,327
|
| Unrealized losses |
$ (2,887)
|
$ (3,466)
|
| U. S. agency securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
79
|
85
|
| Less than 12 months, estimated fair value |
$ 499,312
|
$ 490,699
|
| Less than 12 months, unrealized losses |
(50,108)
|
(58,437)
|
| 12 months or greater, estimated fair value |
175,155
|
179,029
|
| 12 months or greater, unrealized losses |
(17,119)
|
(19,612)
|
| Estimated fair value |
674,467
|
669,728
|
| Unrealized losses |
$ (67,227)
|
$ (78,049)
|
| Residential mortgage-backed securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
158
|
157
|
| Less than 12 months, estimated fair value |
$ 0
|
$ 3,994
|
| Less than 12 months, unrealized losses |
0
|
0
|
| 12 months or greater, estimated fair value |
800,166
|
808,697
|
| 12 months or greater, unrealized losses |
(105,358)
|
(117,072)
|
| Estimated fair value |
800,166
|
812,691
|
| Unrealized losses |
$ (105,358)
|
$ (117,072)
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
143
|
143
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
$ 0
|
$ 0
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
0
|
0
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
647,470
|
652,667
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
(77,286)
|
(88,390)
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
647,470
|
652,667
|
| Gross unrealized losses |
$ (77,286)
|
$ (88,390)
|
| Commercial mortgage-backed securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
13
|
14
|
| Less than 12 months, estimated fair value |
$ 0
|
$ 471
|
| Less than 12 months, unrealized losses |
0
|
(2)
|
| 12 months or greater, estimated fair value |
50,282
|
49,742
|
| 12 months or greater, unrealized losses |
(5,139)
|
(5,856)
|
| Estimated fair value |
50,282
|
50,213
|
| Unrealized losses |
$ (5,139)
|
$ (5,858)
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
16
|
16
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
$ 0
|
$ 0
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
0
|
0
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
80,907
|
80,564
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
(11,234)
|
(11,993)
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
80,907
|
80,564
|
| Gross unrealized losses |
$ (11,234)
|
$ (11,993)
|
| Municipal bonds |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
1
|
1
|
| Less than 12 months, estimated fair value |
$ 0
|
$ 0
|
| Less than 12 months, unrealized losses |
0
|
0
|
| 12 months or greater, estimated fair value |
8,482
|
8,299
|
| 12 months or greater, unrealized losses |
(432)
|
(658)
|
| Estimated fair value |
8,482
|
8,299
|
| Unrealized losses |
(432)
|
$ (658)
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
|
43
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
|
$ 3,110
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
|
(45)
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
|
113,071
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
|
(12,047)
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
|
116,181
|
| Gross unrealized losses |
$ (8,690)
|
$ (12,092)
|
| Corporate bonds |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Number of securities | security |
1
|
1
|
| Less than 12 months, estimated fair value |
$ 0
|
$ 0
|
| Less than 12 months, unrealized losses |
0
|
0
|
| 12 months or greater, estimated fair value |
1,812
|
1,825
|
| 12 months or greater, unrealized losses |
(188)
|
(175)
|
| Estimated fair value |
1,812
|
1,825
|
| Unrealized losses |
$ (188)
|
$ (175)
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
32
|
30
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
$ 21,367
|
$ 20,771
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
(2,596)
|
(3,183)
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
96,572
|
86,451
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
(11,719)
|
(9,775)
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
117,939
|
107,222
|
| Gross unrealized losses |
$ (14,315)
|
$ (12,958)
|
| Municipal bonds |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security |
43
|
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value |
$ 3,122
|
|
| Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss |
(29)
|
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value |
116,348
|
|
| Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss |
(8,661)
|
|
| Debt securities, held-to-maturity, unrealized loss position, fair value |
119,470
|
|
| Gross unrealized losses |
$ (8,690)
|
|