Loans Receivable, Net - Credit Grades and Risk Characteristics (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	$ 1,699,020	$ 1,496,628
Financing receivable, year two, originated, fiscal year before current fiscal year	1,264,571	1,313,707
Financing receivable, year three, originated, two years before current fiscal year	1,097,563	817,607
Financing receivable, year four, originated, three years before current fiscal year	644,593	800,731
Financing receivable, year five, originated, four years before current fiscal year	665,746	620,952
Financing receivable, originated, more than five years before current fiscal year	2,327,015	2,340,571
Financing receivable, revolving	483,324	365,910
Total	8,181,832	7,756,106
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	67,130	137,993
Financing receivable, year two, originated, fiscal year before current fiscal year	26,625	42,604
Financing receivable, year three, originated, two years before current fiscal year	30,510	30,036
Financing receivable, year four, originated, three years before current fiscal year	19,075	21,076
Financing receivable, year five, originated, four years before current fiscal year	10,509	34,914
Financing receivable, originated, more than five years before current fiscal year	75,593	61,163
Financing receivable, revolving	228,232	142,870
Total	457,674	470,656
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	67,130	137,262
Financing receivable, year two, originated, fiscal year before current fiscal year	25,950	40,737
Financing receivable, year three, originated, two years before current fiscal year	27,728	27,967
Financing receivable, year four, originated, three years before current fiscal year	17,799	18,845
Financing receivable, year five, originated, four years before current fiscal year	10,361	33,568
Financing receivable, originated, more than five years before current fiscal year	74,014	59,339
Financing receivable, revolving	220,570	134,140
Total	443,552	451,858
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	150
Financing receivable, year two, originated, fiscal year before current fiscal year	72	583
Financing receivable, year three, originated, two years before current fiscal year	240	826
Financing receivable, year four, originated, three years before current fiscal year	438	1,422
Financing receivable, year five, originated, four years before current fiscal year	96	907
Financing receivable, originated, more than five years before current fiscal year	601	118
Financing receivable, revolving	2,797	1,429
Total	4,244	5,435
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	581
Financing receivable, year two, originated, fiscal year before current fiscal year	603	1,284
Financing receivable, year three, originated, two years before current fiscal year	2,542	1,243
Financing receivable, year four, originated, three years before current fiscal year	838	809
Financing receivable, year five, originated, four years before current fiscal year	52	439
Financing receivable, originated, more than five years before current fiscal year	978	1,706
Financing receivable, revolving	4,865	7,301
Total	9,878	13,363
Commercial real estate – owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	84,621	96,888
Financing receivable, year two, originated, fiscal year before current fiscal year	77,638	152,688
Financing receivable, year three, originated, two years before current fiscal year	141,689	140,203
Financing receivable, year four, originated, three years before current fiscal year	136,694	128,477
Financing receivable, year five, originated, four years before current fiscal year	119,251	125,056
Financing receivable, originated, more than five years before current fiscal year	549,766	481,743
Financing receivable, revolving	14,314	20,010
Total	1,123,973	1,145,065
Commercial real estate – owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	84,621	96,888
Financing receivable, year two, originated, fiscal year before current fiscal year	74,192	114,506
Financing receivable, year three, originated, two years before current fiscal year	126,131	122,962
Financing receivable, year four, originated, three years before current fiscal year	124,268	124,050
Financing receivable, year five, originated, four years before current fiscal year	112,848	104,264
Financing receivable, originated, more than five years before current fiscal year	496,831	428,423
Financing receivable, revolving	13,056	18,932
Total	1,031,947	1,010,025
Commercial real estate – owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	3,512
Financing receivable, year three, originated, two years before current fiscal year	2,958	8,240
Financing receivable, year four, originated, three years before current fiscal year	4,010	1,023
Financing receivable, year five, originated, four years before current fiscal year	696	17,115
Financing receivable, originated, more than five years before current fiscal year	15,761	17,811
Financing receivable, revolving	203	439
Total	23,628	48,140
Commercial real estate – owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	3,446	34,670
Financing receivable, year three, originated, two years before current fiscal year	12,600	9,001
Financing receivable, year four, originated, three years before current fiscal year	8,416	3,404
Financing receivable, year five, originated, four years before current fiscal year	5,707	3,677
Financing receivable, originated, more than five years before current fiscal year	37,174	35,509
Financing receivable, revolving	1,055	639
Total	68,398	86,900
Commercial real estate – investor
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	878,697	640,241
Financing receivable, year two, originated, fiscal year before current fiscal year	629,083	653,631
Financing receivable, year three, originated, two years before current fiscal year	588,774	336,148
Financing receivable, year four, originated, three years before current fiscal year	284,762	458,715
Financing receivable, year five, originated, four years before current fiscal year	396,844	297,584
Financing receivable, originated, more than five years before current fiscal year	904,045	904,260
Financing receivable, revolving	240,778	200,885
Total	3,922,983	3,491,464
Commercial real estate – investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	878,697	635,930
Financing receivable, year two, originated, fiscal year before current fiscal year	624,794	628,435
Financing receivable, year three, originated, two years before current fiscal year	535,828	317,104
Financing receivable, year four, originated, three years before current fiscal year	274,668	426,268
Financing receivable, year five, originated, four years before current fiscal year	382,965	281,876
Financing receivable, originated, more than five years before current fiscal year	844,970	812,062
Financing receivable, revolving	237,610	194,913
Total	3,779,532	3,296,588
Commercial real estate – investor | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	15,979
Financing receivable, year three, originated, two years before current fiscal year	23,822	17,113
Financing receivable, year four, originated, three years before current fiscal year	9,409	15,225
Financing receivable, year five, originated, four years before current fiscal year	5,223	4,234
Financing receivable, originated, more than five years before current fiscal year	29,565	55,872
Financing receivable, revolving	0	149
Total	68,019	108,572
Commercial real estate – investor | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	4,311
Financing receivable, year two, originated, fiscal year before current fiscal year	4,289	9,217
Financing receivable, year three, originated, two years before current fiscal year	29,124	1,931
Financing receivable, year four, originated, three years before current fiscal year	685	17,222
Financing receivable, year five, originated, four years before current fiscal year	8,656	11,474
Financing receivable, originated, more than five years before current fiscal year	29,510	36,326
Financing receivable, revolving	3,168	5,823
Total	75,432	86,304
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,677,202	2,648,921
Consumer | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	648,364	596,552
Financing receivable, year two, originated, fiscal year before current fiscal year	510,209	438,125
Financing receivable, year three, originated, two years before current fiscal year	317,605	227,924
Financing receivable, year four, originated, three years before current fiscal year	145,652	166,994
Financing receivable, year five, originated, four years before current fiscal year	120,212	146,683
Financing receivable, originated, more than five years before current fiscal year	659,198	733,181
Financing receivable, revolving	0	0
Total	2,401,240	2,309,459
Consumer | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	20,208	24,954
Financing receivable, year two, originated, fiscal year before current fiscal year	21,016	26,659
Financing receivable, year three, originated, two years before current fiscal year	18,985	83,296
Financing receivable, year four, originated, three years before current fiscal year	58,410	25,469
Financing receivable, year five, originated, four years before current fiscal year	18,930	16,715
Financing receivable, originated, more than five years before current fiscal year	138,413	160,224
Financing receivable, revolving	0	2,145
Total	275,962	339,462
Consumer | Pass | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	648,364	595,982
Financing receivable, year two, originated, fiscal year before current fiscal year	509,408	437,593
Financing receivable, year three, originated, two years before current fiscal year	317,460	226,435
Financing receivable, year four, originated, three years before current fiscal year	145,652	166,773
Financing receivable, year five, originated, four years before current fiscal year	119,991	146,237
Financing receivable, originated, more than five years before current fiscal year	655,803	729,037
Financing receivable, revolving	0	0
Total	2,396,678	2,302,057
Consumer | Pass | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	20,208	24,954
Financing receivable, year two, originated, fiscal year before current fiscal year	21,016	26,659
Financing receivable, year three, originated, two years before current fiscal year	18,985	83,296
Financing receivable, year four, originated, three years before current fiscal year	58,392	25,469
Financing receivable, year five, originated, four years before current fiscal year	18,930	16,565
Financing receivable, originated, more than five years before current fiscal year	135,436	156,276
Financing receivable, revolving	0	2,145
Total	272,967	335,364
Consumer | Special Mention | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	801	532
Financing receivable, year three, originated, two years before current fiscal year	145	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	446
Financing receivable, originated, more than five years before current fiscal year	1,481	2,186
Financing receivable, revolving	0	0
Total	2,427	3,164
Consumer | Special Mention | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	150
Financing receivable, originated, more than five years before current fiscal year	369	382
Financing receivable, revolving	0	0
Total	369	532
Consumer | Substandard | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	570
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	1,489
Financing receivable, year four, originated, three years before current fiscal year	0	221
Financing receivable, year five, originated, four years before current fiscal year	221	0
Financing receivable, originated, more than five years before current fiscal year	1,914	1,958
Financing receivable, revolving	0	0
Total	2,135	4,238
Consumer | Substandard | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	18	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Financing receivable, originated, more than five years before current fiscal year	2,608	3,566
Financing receivable, revolving	0	0
Total	$ 2,626	$ 3,566